Senior Software Engineer (Python) - Operations Automation

🏢 Summary: Senior Software Engineer role focused on building and scaling backend platform services that power web and mobile rendering infrastructure. The position involves architecting high-throughput microservices, maintaining platform stability, reducing technical debt, and supporting AI-driven developer tooling. The role offers hybrid work, performance bonuses, and opportunities to work with large-scale distributed systems. 🗂️ Requirements: Expertise in Kotlin, Expertise in Java, Experience with Spring, Experience with PostgreSQL, Experience with Couchbase, Experience with Kubernetes, Experience with Docker, Experience with microservice architectures, Ability to manage high-throughput systems, Backend engineering experience, System stability and SLA management, Mentoring and technical leadership skills 📃 Skills: Kotlin, Java, Spring, PostgreSQL, Couchbase, GCP, Hermes, Kafka, Kubernetes, Docker, TypeScript, React, GitHub, Consul, GitHubActions, LLM 🏢 Description: About the Job At Allegro, we operate at a massive scale where performance, reliability, and developer efficiency are paramount. Within the Frontend Platform area, we design and maintain the critical infrastructure and tools responsible for building and rendering every website and mobile screen across the entire ecosystem. Our internal, CMS-like solutions are utilized company-wide by everyone from engineers building individual components to non-technical content editors launching complex landing pages, campaign sites, and homepage partials. This high-throughput environment demands exceptional complexity management, structural scalability, and out-of-the-box architectural thinking to boost developer productivity and maintain our core services. The Role As a Senior Software Engineer, your primary focus will be the development, maintenance, and architectural evolution of our core frontend platform services. This is a highly impactful role where your work directly ensures the high availability and stability of Allegro's primary web and mobile rendering traffic. You will be at the very center of product delivery, helping the organization scale efficiently while keeping technical debt to a minimum. Key Responsibilities: Architect, develop, and scale core platform services and content management tools. The primary stack is backend-focused (Kotlin/Java, Spring, PostgreSQL, Couchbase, GCP, Hermes (our open source solution on top of Kafka), Kubernetes/Docker), with the opportunity to occasionally touch or collaborate on the frontend side (TypeScript/React). Actively monitor, optimize, and deep-dive into platform systems to ensure maximum stability, safeguard our SLAs, and reduce technical debt. Provide technical foundation and active support for critical business projects, ensuring new features can be deployed smoothly and swiftly. Lead software development initiatives, supervise and mentor other team members, and document software thoroughly. Analyze the needs of our internal users to deliver features that accelerate company-wide development and deliverability. Shape and develop the platform's foundation to support AI-driven tooling, ensuring our services are ready to seamlessly integrate with AI agents and next-generation developer assistants. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 18 850 - 25 900 Annual bonus based on your annual performance and company results. Long term discretionary incentive plan based on Allegro.eu shares (restricted stock units). Our team is based in Poznań. We are looking for people who: Demonstrate deep expertise in backend engineering with Kotlin/Java. While the role is heavily backend-focused, any familiarity with frontend ecosystems is a great plus that will help you collaborate seamlessly across the platform. Are excited by the challenge of managing critical, high-throughput microservice architectures where system stability is a top priority. Enjoy working closely with an internal customer base, allowing you to receive rapid feedback on your work and see its immediate organizational impact. Are open to experimenting with cutting-edge efficiency boosters. Our team actively explores integrating AI Agents and LLMs into our internal tooling and workflows to optimize daily operations. What’s in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Senior Software Engineer role focused on building and scaling backend platform services, low-code infrastructure, and internal development tools in a large-scale distributed environment. The position involves architecting reliable systems using JVM technologies, cloud infrastructure, and messaging platforms while supporting internal teams with secure and scalable solutions. The role also includes technical leadership, mentoring, and collaboration on frontend or AI-driven initiatives when needed. 🗂️ Requirements: Strong experience with Kotlin, Strong experience with Java, Experience with distributed systems, Experience with Kafka, Experience with queuing systems, Experience with PostgreSQL, Knowledge of backend engineering on JVM, Ability to work with cloud platforms, Experience with Kubernetes and Docker, English proficiency at B2 level or higher, Experience leading software development initiatives, Analytical and problem-solving mindset 📃 Skills: Kotlin, Java, Spring, Kafka, PostgreSQL, MongoDB, Azure, GCP, Kubernetes, Docker, TypeScript, React, Python, GitHub, Consul 🏢 Description: About the job At Allegro, we operate at a massive scale where performance, reliability, and developer efficiency are paramount. Within our multi-product platform team, we design and maintain the critical infrastructure, low-code engines, and shared technical solutions used by other engineering teams to build secure and auditable internal tools across the entire ecosystem. Our internal platform solutions are utilized company-wide to streamline data access and simplify admin tool creation. This environment demands exceptional complexity management, structural scalability, and out-of-the-box architectural thinking to eliminate repetitive developer bottlenecks and ensure that our customer support department can operate without disruption. The Role As a Senior Software Engineer, your primary focus will be the development, maintenance, and architectural evolution of our core backend platform services and low-code infrastructure. This is a highly impactful, well-rounded role where you will ensure the high availability, security, and stability of systems that power internal applications company-wide. You will help the organization scale efficiently while keeping technical debt to a minimum. Key Responsibilities: - Design & Development: Architect, develop, and scale core platform services, messaging components, and internal development tools. The primary stack is backend-focused (Kotlin/Java, Spring, Kafka, queuing systems, PostgreSQL, MongoDB, Cloud - Azure/GCP, Kubernetes/Docker), with the opportunity to occasionally collaborate on the frontend (TypeScript/React) or AI-driven services (Python). - Stability & Reliability: Actively monitor, optimize, and deep-dive into platform systems to ensure maximum stability and safeguard our internal SLAs. You will share responsibility for system availability by participating in our casual on-call duty rotation. - Enabling Internal Teams: Provide a robust technical foundation and clear abstraction layers so other teams can build and deploy their tools swiftly, securely, and consistently. - Project & Team Leadership: Lead software development initiatives, supervise and mentor other team members, and document software thoroughly. - Stakeholder Collaboration: Analyze the needs of our internal users to deliver features that accelerate company-wide development and eliminate repetitive manual work. Important things for you: - Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. - 30 days of occasional remote work. - Salary range: PLN 18 850 - 25 900. - Annual bonus based on annual performance and company results. - Team based in Poznań. We are looking for people who: - Demonstrate deep expertise in backend engineering with Kotlin/Java and proven experience with distributed systems, Kafka, queuing systems, and PostgreSQL. - Are open to a diverse technical environment including React/TypeScript and Python. - Understand the business criticality of internal platform tools with a focus on security, auditability, and stability. - Enjoy working closely with internal users and receiving rapid feedback. - Are open to experimenting with AI Agents and LLMs in tooling and workflows. - Maintain an analytical mindset and focus on automation. - Communicate in English at B2 level or higher. What's in it for you: - Well-equipped offices and ergonomic work environment. - Choice of MacBook Pro or Dell laptop with accessories. - Cafeteria-style fringe benefits including medical, sports, lunch packages, insurance, and vouchers. - English classes related to the job. - Training budget, hackathons, and internal learning platform. - Additional day off for volunteering. - Social events and integration activities. #goodtobehere means that: - Working with experienced specialists in a highly autonomous environment. - Access to a modern developer ecosystem based on Kubernetes, Docker, Consul, GitHub, and GitHub Actions. - Use of AI tools to automate repetitive tasks. - Opportunity to work at large scale with microservices, service mesh, machine learning, and high-throughput systems. - Participation in tech communities, conferences, podcasts, and internal engineering events.

🏢 Summary: Backend engineering role focused on building secure, scalable systems for fraud prevention, compliance, and data transparency in a large-scale marketplace environment. The position involves developing automation-driven backend platforms using Python, JVM technologies, cloud data tools, and modern infrastructure. The team offers high architectural autonomy, hybrid work, and opportunities to work with large-scale distributed systems and ML-supported solutions. 🗂️ Requirements: Python, Willingness to work with JVM languages, Experience with Kotlin, GCP, BigQuery, Dataproc, Clean code practices, Code reviews, Analytical mindset, Problem-solving skills, English B2 📃 Skills: Python, Kotlin, JVM, GCP, BigQuery, Dataproc, Spark, SQL, MachineLearning, MLOps, Kubernetes, Docker, Consul, GitHub, GitHubActions, MacBook, Windows 🏢 Description: About the job: Maintaining top-tier safety standards at macro scale: Allegro is a safe platform for millions of users. You will design, develop, and maintain backend systems that keep frauds and policy violations at an absolute minimum. Designing core data-sharing and transparency platforms: You will design, develop, and maintain high-security internal platforms responsible for trusted data exposure and compliance. Instead of dealing with legacy external tech, you will build modern abstraction layers that handle data flows, strict auditing, and access control. Data-driven engineering culture: We focus on automation, clean documentation, and code optimization. We actively eliminate repetitive manual work in favor of building stable, scalable system solutions. Mature and collaborative team: You will join a 6-person team with a strong senior presence. We heavily value engineering craftsmanship, knowledge sharing and high architectural autonomy. Technological Compliance & R&D: You will design solutions where advanced backend architecture meets evolving regulatory landscapes and market dynamics. Your work involves building intelligent tools that guarantee the transparency of our marketplace and quickly adapt to sophisticated, creative patterns, making our marketplace resilient to any emerging risks. Pragmatic Tech Stack : We select the best tools for the job rather than sticking to one framework. Our ecosystem includes JVM languages and Python. We process data using BigQuery and Spark jobs, utilize graph, relational and document databases, and implement traditional Machine Learning models to support decision-making. Driving Automation : You will play a key role in transforming how we handle verification processes. We are moving heavily towards automation to make our systems faster, more accurate, and less reliant on manual intervention. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 18 850 - 25 900 Annual bonus based on your annual performance and company results. Long term discretionary incentive plan based on Allegro.eu shares (restricted stock units). Our team is based in Poznań. We are looking for people who: Code in Python and is willing to expand into JVM languages (Kotlin) to work with other parts of our system. Are comfortable with GCP tools , particularly BigQuery and Dataproc. Want to build solid, clean code , actively participate in code reviews, and enjoy sharing knowledge with the team. Have a strong sense of ownership and mission , wanting to directly impact the safety of millions of Allegro users. Possess an analytical mindset and a problem-solving attitude. Use AI tools to boost daily productivity but maintain critical thinking and never blindly accept code suggestions. Communicate in English at a B2 level or higher. Nice to have: Experience or strong interest in Machine Learning (ML) and MLOps What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Engineering role focused on designing, building, and optimizing AI-driven microservices that power a conversational marketplace assistant. The position involves LLM orchestration, Retrieval-Augmented Generation, semantic search, and high-performance retrieval in a cloud-native environment. You will own end-to-end development of AI services across Java/Kotlin and Python ecosystems, ensuring scalability, low latency, and high availability. 🗂️ Requirements: Proficiency in Python, Proficiency in Java, Proficiency in Kotlin, Experience with LLM orchestration, Experience with Retrieval-Augmented Generation (RAG), Experience with semantic search and vector search, Experience building microservices, Experience with cloud-native architectures, Ability to design and optimize high-availability systems, English level B2 or higher 📃 Skills: Python, Java, Kotlin, Spring, ADK, LangChain, Langfuse, LLM, RAG, LoRA, PEFT, AutoGen, CrewAI, Kubernetes, Docker, Consul, GitHub, GitHubActions, VectorSearch, Embeddings 🏢 Description: About the job: Performance & Scale: Design, build, and optimize AI-driven systems that process complex natural language interactions. Delivering low-latency, high-quality responses from our AI Assistant requires high-availability and smart optimization of LLM and retrieval workloads in practice. Modern Tech Stack: Work with a world-class, cloud-native polyglot environment. Our core backend technologies include Java , Kotlin , Spring, and ADK . At the same time, our AI and orchestration layer heavily relies on Python . You will utilize Python and LangChain for complex LLM orchestration, alongside Langfuse for observability, prompt tracking, and evaluation. We leverage advanced vector search and modern ML solutions to make our assistant truly smart. True Ownership & Autonomy: We live by a "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your AI microservices and data pipelines, from design to deployment; and improvements are dictated by results of our own experiments and AI evaluation metrics. Complex Challenges: From LLM orchestration and Retrieval-Augmented Generation (RAG) to semantic search optimization, you'll tackle the complex backend problems that power a conversational marketplace assistant. You will work across the Java/Kotlin and Python ecosystems, integrating advanced embedding models, prompt pipelines, and vector databases to ensure our AI deeply understands and accurately retrieves information. In our domain, we focus on delivering the core search and retrieval capabilities for the Allegro AI Assistant. We maintain a critical entry point for users looking to discover products, compare offers, and get personalized recommendations through natural conversations. Striving for relevancy and accuracy first, we are designing, implementing, and operating an extensive system combining modern microservice architecture with Large Language Models, high-performance retrievers, and vast data sources. We care about data quality, robust context building, and near real-time accuracy to best guide users through a highly dynamic marketplace via an intelligent, conversational interface. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 200 - 20 200 Annual bonus based on your annual performance and company results. Our team is based in Poznań. We are looking for people who: Code in Python, Java and Kotlin ; Expect work that requires creative approach to search experience challenges, to be proud of enjoying its results together with all Allegro users; Want to create solid code, eagerly accept comments and share knowledge during code reviews; Can look for effective solutions to the requirements set by users; Want to constantly develop and update their knowledge; Know English at at least B2 level. Nice to have: You are open to diverse technologies and workflows, including dev-operational tools on one hand, and working with data on the other. Basic experience with LLM tuning (LoRA, PEFT), training and evaluation pipelines for models and/or basic frameworks for building AI Agents (Agent Development Kit, LangChain, AutoGen, CrewAI) would be great! What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: The offer is for a Software Engineer 2 focused on backend development in Kotlin, working on large-scale logistics and delivery selection systems handling tens of thousands of requests per second. The role centers on designing scalable architectures, improving high-volume data processing, and ensuring reliability of mission-critical services. You will own complex systems impacting operational efficiency and platform resilience. 🗂️ Requirements: Strong background in backend development with Kotlin, Experience in software architecture and scalable system design, Experience with high-volume data processing systems, Ability to monitor system health and operational metrics, Willingness to participate in off-hours duty, English proficiency at B2+ level 📃 Skills: Kotlin, Kubernetes, Docker, Consul, GitHub, GitHubActions, AI, Microservices 🏢 Description: About the Job Allegro is home to 2,500+ tech experts, but our teams? They’re the ones ensuring the physical reality of e-commerce runs flawlessly. We are looking for engineers who want to solve large-scale challenges in areas critical to the Allegro shopping journey and logistics platform - from delivery selection to the systems powering order fulfillment at massive scale. Logistics Platform & Location Intelligence This team is the driving force behind the Logistics platform, focused on the massive-scale ecosystem behind order fulfillment. Their strategic imperative is vital: ensuring business continuity and total platform independence by building systems robust and scalable enough to instantly absorb total traffic volume. They are currently tackling scale challenges by evolving how system capacity and traffic routing are managed, while expanding a network of external logistics partners. As they refactor the architecture to process hundreds of millions of records, accurately predict system load, and optimize volume distribution, they are also defining and executing a unified, cross-organizational location intelligence strategy — moving beyond ad-hoc solutions to standardize geo-data and optimize how addressing is handled at scale. Delivery Selection This team works on one of the most critical parts of the Allegro shopping journey: delivery selection. They build solutions that handle around 40k requests per second, deploy to production multiple times a day, and treat every change as an independent increment. Because without delivery selection no order can happen, they care deeply about code quality, automated testing, and reliability. At the same time, they invest in knowledge sharing, continuous development, and use AI in their daily work to support nearly every stage of building new features. If you hate fragile systems, have a deeply analytical mindset, and want to build infrastructure that thrives under pressure, you’ll be in the right place. The Role We are looking for a Software Engineer 2 with a strong background in back-end programming ( Kotlin ) and software architecture who is ready to lead structural improvements in high-volume data processing software and location intelligence. You will be taking ownership of complex systems where your decisions directly impact our operational efficiency. Your day-to-day will involve everything from designing scalable system architecture and tackling complex technical challenges, to writing high-quality code and ensuring the stability of core software products. Because our systems are mission-critical, you will also monitor core system health and operational metrics, ensuring high performance, data accuracy, cost-efficiency and you will participate in off-hours duty for team products. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Warsaw. We are looking for people who: Possess a strong background in back-end coding (Kotlin) and software architecture to design reliable, high-performance systems for massive-scale data. Desire work with measurable results, focusing on building resilient logistics ecosystems and ensuring flawless operational smoothness across markets. Take pride in their code, actively manage technical debt, create clear documentation, and mentor less experienced team members. Find effective solutions for complex challenges, weighing trade-offs between custom and 3rd-party software and integrating solutions smoothly. Navigate tasks from well-defined to ambiguous, bridging technical expertise and logistics domain knowledge for optimal architectural decisions. Continuously develop their knowledge, staying up-to-date with advancements in back-end architecture, high-volume data processing, and logistics operations. Know English at a B2+ level and can clearly translate complex technical concepts to technical and non-technical stakeholders. What’s in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 2000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: The role focuses on designing, building, and optimizing AI-driven backend systems that power a large-scale conversational assistant with low-latency, high-availability requirements. You will work across Java/Kotlin and Python ecosystems to implement LLM orchestration, RAG pipelines, and semantic search solutions within a cloud-native microservices architecture. The position involves full ownership of AI microservices and data pipelines from design to deployment in a production-scale environment. 🗂️ Requirements: Proficiency in Python, Proficiency in Java, Proficiency in Kotlin, Experience with LLM orchestration and RAG, Experience with microservices architecture, Experience with vector search and semantic search, Experience with cloud-native environments, Ability to design and optimize high-availability, low-latency systems, English level B2 or higher 📃 Skills: Python, Java, Kotlin, Spring, ADK, LangChain, Langfuse, LLM, RAG, Kubernetes, Docker, Consul, GitHub, GitHubActions, VectorSearch, Microservices 🏢 Description: About the job: Performance & Scale: Design, build, and optimize AI-driven systems that process complex natural language interactions. Delivering low-latency, high-quality responses from our AI Assistant requires high-availability and smart optimization of LLM and retrieval workloads in practice. Modern Tech Stack: Work with a world-class, cloud-native polyglot environment. Our core backend technologies include Java , Kotlin , Spring, and ADK . At the same time, our AI and orchestration layer heavily relies on Python . You will utilize Python and LangChain for complex LLM orchestration, alongside Langfuse for observability, prompt tracking, and evaluation. We leverage advanced vector search and modern ML solutions to make our assistant truly smart. True Ownership & Autonomy: We live by a "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your AI microservices and data pipelines, from design to deployment; and improvements are dictated by results of our own experiments and AI evaluation metrics. Complex Challenges: From LLM orchestration and Retrieval-Augmented Generation (RAG) to semantic search optimization, you'll tackle the complex backend problems that power a conversational marketplace assistant. You will work across the Java/Kotlin and Python ecosystems, integrating advanced embedding models, prompt pipelines, and vector databases to ensure our AI deeply understands and accurately retrieves information. In our domain, we focus on delivering the core search and retrieval capabilities for the Allegro AI Assistant. We maintain a critical entry point for users looking to discover products, compare offers, and get personalized recommendations through natural conversations. Striving for relevancy and accuracy first, we are designing, implementing, and operating an extensive system combining modern microservice architecture with Large Language Models, high-performance retrievers, and vast data sources. We care about data quality, robust context building, and near real-time accuracy to best guide users through a highly dynamic marketplace via an intelligent, conversational interface. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Poznań. We are looking for people who: Code in Python, Java and Kotlin ; Expect work that requires creative approach to search experience challenges, to be proud of enjoying its results together with all Allegro users; Want to create solid code, eagerly accept comments and share knowledge during code reviews; Can look for effective solutions to the requirements set by users; Want to constantly develop and update their knowledge; Know English at at least B2 level. Nice to have: You are open to diverse technologies and workflows, including dev-operational tools on one hand, and working with data on the other. Basic experience with LLM tuning (LoRA, PEFT), training and evaluation pipelines for models and/or basic frameworks for building AI Agents (Agent Development Kit, LangChain, AutoGen, CrewAI) would be great! What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Senior Software Engineer role focused on building and scaling high-throughput Python services for a Delivery Optimization Engine that solves complex routing and logistics problems. The position centers on network analysis, geospatial data processing, and microservices architecture to optimize first- and last-mile operations. You will work with cloud-native technologies and modern infrastructure to enhance large-scale logistics efficiency. 🗂️ Requirements: Minimum 4 years of commercial backend development experience in Python and SQL, Experience or strong understanding of logistics domain, network analysis, and routing algorithms, Practical experience with geospatial data concepts (e.g., spatial indexing, clustering, PostGIS), Experience with cloud platforms (Google Cloud Platform preferred), Experience with Kubernetes, Terraform, and Airflow, Ability to design and scale microservices-based architecture, Knowledge of clean code practices, TDD, CI/CD, and code reviews, Higher technical education in Computer Science or related field 📃 Skills: Python, SQL, GCP, BigQuery, Dataflow, Airflow, Kubernetes, Terraform, PostGIS, H3, Microservices, CI/CD, TDD, Docker, Consul, GitHub, Routing, Graph, Clustering 🏢 Description: About the Team The Location Intelligence Engineering team is part of the Delivery Experience (DEX) area at Allegro. We have recently extended our focus from internal supporting tools to driving the core technical engine behind our logistics support. Through the Delivery Optimization Engine (DOE), we solve complex, large-scale problems in routing, automated parcel sequencing, and dynamic courier zone balancing. Our high-performance services directly compress fleet size and maximize vehicle utilization across our rapidly growing logistics network in Poland and abroad. As a Senior Software Engineer specializing in Python and routing algorithms, you will design and scale the high-throughput services that power our first and last-mile operations. By leveraging network analysis and spatial optimization, you will help us build the next generation of Allegro's Delivery Optimization Engine and directly redefine our logistics efficiency. We are looking for people who: Have at least 4 years of commercial experience in backend software development using Python and SQL. Possess experience or a strong understanding of the logistics domain, network analysis, and routing (e.g., graph theory, road network modeling, Vehicle Routing Problems). Have experience with geospatial data concepts applied via code (e.g., H3/spatial indexing, clustering algorithms, PostGIS). Are familiar with cloud ecosystems (Google Cloud Platform preferred) and modern infrastructure tools (Kubernetes, Terraform, Airflow). Advocate for engineering excellence, including clean code, TDD, CI/CD, and a strong commitment to rigorous code reviews to maintain team architectural stability. Know how to design and scale a microservices-based architecture. Have a positive attitude, excellent teamwork skills, and a higher technical education (Computer Science or related fields). Why is it worth working with us? Real-World Impact: You will build the algorithms and data foundations that directly optimize routes and fleet utilization for first and last-mile operations. Modern Tech Stack: We are bypassing traditional, legacy GIS software in favor of cloud-native Python architectures, Big Data solutions, and modern routing APIs (e.g., Google, HERE, open-source routing engines). Stability & Integration: We offer long-term stability and deep team integration via an Umowa o Pracę (UoP) contract within a highly collaborative engineering environment. Our Current Technology Stack Includes: Backend & Routing: Python, Microservices, Open-source & Commercial Routing Engines. Data & Cloud: Google Cloud Platform (BigQuery, Dataflow, Composer/Airflow), SQL. Infrastructure: Kubernetes, Terraform, CI/CD pipelines. What's in it for you: Flexible working hours in the hybrid model (4 days in the office / 1 day remote) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. Long term discretionary incentive plan based on Allegro.eu shares (restricted stock units). Annual bonus based on your annual performance and company results. Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Software Engineer 2 role focused on designing and evolving high-volume backend systems for logistics platform and delivery selection, handling massive-scale data and traffic. The position involves leading architectural improvements, ensuring system reliability, and optimizing location intelligence and order fulfillment processes. The engineer owns mission-critical services operating at very high request rates and large data scale. 🗂️ Requirements: Strong experience in backend development with Kotlin, Experience designing scalable software architecture, Experience with high-volume data processing systems, Ability to design and maintain distributed systems, Experience with microservices-based architectures, Ability to monitor system health and performance metrics, Experience with traffic routing and capacity management, English proficiency at B2+ level 📃 Skills: Kotlin, Architecture, Microservices, Kubernetes, Docker, Consul, GitHub, GitHubActions, Hermes, ServiceMesh, AI, DataProcessing, LocationIntelligence, Monitoring 🏢 Description: About the Job Allegro is home to 2,500+ tech experts, but our teams? They’re the ones ensuring the physical reality of e-commerce runs flawlessly. We are looking for engineers who want to solve large-scale challenges in areas critical to the Allegro shopping journey and logistics platform — from delivery selection to the systems powering order fulfillment at massive scale. Logistics Platform & Location Intelligence This team is the driving force behind the Logistics platform, focused on the massive-scale ecosystem behind order fulfillment. Their strategic imperative is vital: ensuring business continuity and total platform independence by building systems robust and scalable enough to instantly absorb total traffic volume. They are currently tackling scale challenges by evolving how system capacity and traffic routing are managed, while expanding a network of external logistics partners. As they refactor the architecture to process hundreds of millions of records, accurately predict system load, and optimize volume distribution, they are also defining and executing a unified, cross-organizational location intelligence strategy — moving beyond ad-hoc solutions to standardize geo-data and optimize how addressing is handled at scale. Delivery Selection This team works on one of the most critical parts of the Allegro shopping journey: delivery selection. They build solutions that handle around 40k requests per second, deploy to production multiple times a day, and treat every change as an independent increment. Because without delivery selection no order can happen, they care deeply about code quality, automated testing, and reliability. At the same time, they invest in knowledge sharing, continuous development, and use AI in their daily work to support nearly every stage of building new features. If you hate fragile systems, have a deeply analytical mindset, and want to build infrastructure that thrives under pressure, you’ll be in the right place. The Role We are looking for a Software Engineer 2 with a strong background in back-end programming ( Kotlin ) and software architecture who is ready to lead structural improvements in high-volume data processing software and location intelligence. You will be taking ownership of complex systems where your decisions directly impact our operational efficiency. Your day-to-day will involve everything from designing scalable system architecture and tackling complex technical challenges, to writing high-quality code and ensuring the stability of core software products. Because our systems are mission-critical, you will also monitor core system health and operational metrics, ensuring high performance, data accuracy, cost-efficiency and you will participate in off-hours duty for team products. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Warsaw. We are looking for people who: Are Architecture-Minded : Possess a strong background in back-end coding (Kotlin) and software architecture to design reliable, high-performance systems for massive-scale data. Seek Impact : Desire work with measurable results, focusing on building resilient logistics ecosystems and ensuring flawless operational smoothness across markets. Value Craftsmanship : Take pride in their code, actively manage technical debt, create clear documentation, and mentor less experienced team members. Are Problem Solvers : Find effective solutions for complex challenges, weighing trade-offs between custom and 3rd-party software and integrating solutions smoothly. Embrace Complexity : Navigate tasks from well-defined to ambiguous, bridging technical expertise and logistics domain knowledge for optimal architectural decisions. Are Life-long Learners : Continuously develop their knowledge, staying up-to-date with advancements in back-end architecture, high-volume data processing, and logistics operations. Communicate Effectively : Know English at a B2+ level and can clearly translate complex technical concepts to technical and non-technical stakeholders. What’s in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 2000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Senior Software Engineer role focused on designing and optimizing high-availability, high-performance microservices in a cloud-native environment at massive scale. The position involves full ownership of backend services, working with Java/Kotlin, Big Data workflows, and distributed systems powering a real-time marketplace. You will build, deploy, and maintain scalable systems handling thousands of requests per minute. 🗂️ Requirements: Proficiency in Java or Kotlin, Willingness to work with Kotlin in production, Experience with microservices architecture, Experience with cloud environments, Knowledge of distributed systems, Experience with Big Data workflows, Ability to work with Airflow and BigQuery, Understanding of scalable and resilient system design, Ability to take end-to-end ownership of services, English level B2 or higher 📃 Skills: Java, Kotlin, Spring, MongoDB, Microservices, GCP, React, Airflow, BigQuery, Kubernetes, Docker, Consul, GitHub, GitHubActions 🏢 Description: Senior Software Engineer Location: Kraków, PL, 31-503 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee About the job Massive Scale : Design, build, and optimize systems that handle thousands of requests per minute. This is high-availability, high-performance engineering in practice. Modern Tech Stack : Work with a world-class, cloud-native environment (GCP). Our core technologies include Java, Kotlin, Spring, MongoDB, microservices, React, Airflow (BigData). True Ownership & Autonomy : We live by a "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your microservices, from design to deployment. Complex Challenges : From distributed systems and data streaming to algorithmic optimization, you'll tackle the complex backend problems that power a massive, real-time marketplace. About us We are the team behind Allegro Prices - one of our most important pricing programs. As part of the Competitive Price unit, we build its logic and grow its reach to keep our prices competitive. Our main goal is to ensure great deals on the products that shoppers actually look for. We do this at scale using full automation and data from many different sources Important things for you Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 9:30 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 18 400 - 25 450 Annual bonus based on your annual performance and company results. Our team is based in Kraków and Warsaw. We are looking for people who: Code in Kotlin or Java and are excited to master Kotlin in a production environment. Are open to diverse technologies , including Frontend. You don’t need to be a React master, but you’re ready to mentor Frontend engineers on architectural patterns and help build a truly cross-functional team. Want to grow into Big Data , learning how to handle large-scale datasets and build workflows with Airflow and BigQuery . Want to be proud of the code they create ; they value high-quality code reviews and engage in substantive discussions on software engineering best practices; Feel comfortable interacting with stakeholders and taking full end-to-end ownership of initiatives - from initial requirements gathering through implementation to post-deployment monitoring; Have a solid foundation in microservices architecture and feel at home working in cloud environments , understanding how to build scalable and resilient systems; Know English at at least B2 level. What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Hybrid Software Engineer role focused on Kotlin backend development with growth into full-stack technologies including TypeScript, JavaScript, and React. The position involves building and scaling Server-Driven UI infrastructure and AI-assisted developer tooling used by internal engineering teams. Offers flexible hybrid work, annual bonus, modern equipment, and extensive learning and benefits programs. 🗂️ Requirements: Strong Kotlin experience, Backend architecture knowledge, Spring experience, Willingness to work full-stack, TypeScript knowledge, JavaScript knowledge, React knowledge, Ability to solve complex technical challenges, Code review collaboration, English B2+ 📃 Skills: Kotlin, Spring, TypeScript, JavaScript, React, Kubernetes, Docker, Consul, GitHub, GitHubActions, JSON, AI, MacBook, Windows 🏢 Description: Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Warsaw. About the Job : Allegro is home to 1,700+ tech experts, but our team? We’re the ones building the backbone. We are part of the Core Platform, focusing on Server-Driven UI platform that allows our product teams to ship native experiences straight from the backend. We’re currently scaling Opbox Studio, our next-gen React-based stack. But we’re not just building another internal tool. We are pivoting to an Agentic AI-first approach. This means we’re leveraging specialized AI agents to automate UI generation and layout logic, effectively redefining how Developer Experience looks at scale. If you hate repetitive tasks, have a product-oriented mindset, and want to build infra that "thinks" for other developers – you’re in the right place. The Role We are looking for a Software Engineer with a strong background in Kotlin and backend solutions (Spring) who is also eager to grow and expand their skills into a full-stack role encompassing TypeScript/JS, React . We are a cross-competent, full-stack oriented team with diverse competencies, bridging the gap between backend microservices and modern web technologies. We are passionate about our internal users and work closely with various product teams. We are looking for people who: Have a strong background coding in Kotlin (and backend architectures) and are highly willing to work as a full-stack developer by actively learning and writing code in TypeScript, JavaScript, and React. Expect work that has a deeper meaning and want to enjoy its results - specifically by building tools that directly accelerate the work of hundreds of other engineers. Want to be proud of the code they create. They eagerly accept comments and share knowledge during code reviews. Can look for effective solutions that solve complex business and technical challenges (such as designing dynamic API contracts or handling complex JSON-based component tree structures). Want to constantly develop their knowledge, not only regarding backend software but also in the world of modern cross-platform rendering, Server-Driven UI, and applied Agentic AI. Know English at a B2+ level. What’s in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!