Junior Software Engineer - Notifications Platform

🏢 Summary: Build and operate high-performance backend and ML-enabled advertising systems for a large real-time marketplace. The role offers end-to-end ownership of cloud-native microservices, data-processing infrastructure, and new product development in a hybrid work model. 🗂️ Requirements: Kotlin or Scala, Spring Boot, Kafka, Backend systems experience, English B2 or higher 📃 Skills: Java, Kotlin, Scala, Spring, Kafka, Kubernetes, BigQuery, Spark, GCP, Docker, Consul, GitHub, Hermes 🏢 Description: Software Engineer 1 (Java / Kotlin) Allegro Ads Location: Warszawa, PL, 00-841 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. Our core technologies include Kotlin, Spring, Kafka, and Kubernetes. We're not shy when it comes to ML too :) 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. End-to-End ML Systems: Bridge the gap between big data and real-time product impact. You’ll build the infrastructure using BigQuery and Apache Spark for offline data processing. You’ll integrate these components with our microservices architecture to create the sophisticated advertising system that powers a personalized user experience. Join the Advertising team! You will have a chance to build Allegro Ads - one of the most visible products on the platform. Your team works closely with the Machine Learning team, creating the best experience for customers. High performance, engineering best practices and great atmosphere in the team guaranteed! 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 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Warsaw. We are looking for people who: Code in Kotlin or Scala and have experience with Spring Boot and Kafka to build robust backend systems; 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; Are excited about building new products and want to experience the journey of launching a fresh project within the Allegro ecosystem; Are open to developing soft skills and embracing a growth mindset through active participation in code reviews, pair programming, and team retrospectives.; Are open to incorporating AI coding assistants into their daily work to maximize efficiency and focus on complex problem-solving Can look for effective solutions to the requirements set by users; Want to constantly develop and update their knowledge; Are enthusiastic about AI and want to stay at the forefront of technical innovation; Are excited to join a growing team where they can influence the technical vision and help shape new projects from the ground up within the ecosystem; Are eager to learn and experiment with modern cloud infrastructure (GCP, Docker, Kubernetes, AI); 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: Build and scale backend microservices for an AI Partner Assistant, supporting real-time, data-driven experiences under high traffic. The role uses Java or Kotlin, Spring Boot and Kafka, with opportunities to develop LLM agents, prompt engineering and AI-quality evaluation skills. 🗂️ Requirements: Java or Kotlin, Spring Boot, Kafka, English — B2 or higher 📃 Skills: Java, Kotlin, SpringBoot, Kafka 🏢 Description: About the job The Partner Experience team supports Partner processes end to end: acquiring, registering, verifying and setting up Partner accounts; publishing and editing listings; order management; sales statistics; payments and price-list management; and API integrations. The work involves heavy traffic, large data volumes and scaling solutions to meet Partner and business needs. Join the team building the Partner AI Assistant. Work closely with other engineering teams to create customer experiences, with a focus on high performance and engineering best practices. Important things for you • Flexible working hours in a 4/1 hybrid model, with start times between 7:00 a.m. and 10:00 a.m. • 30 days of occasional remote work. • Salary range, depending on skills: PLN 11,200–15,250 on an employment contract with tax-deductible costs. • Annual bonus based on individual annual performance and company results. We are looking for people who • Code in Kotlin or Java and have experience with Spring Boot and Kafka to build robust backend systems. • Are enthusiastic about AI and technical innovation. • Build tools for an AI Partner Assistant and drive end-to-end development of robust, highly scalable microservices delivering real-time, data-driven support under high user traffic. • Know how to use LLM models to create agents for automation and conversations, or want to develop in this area. • Know prompt-engineering techniques and LLM-quality evaluation, or want to develop in this area. • Have experience with React and TypeScript for modern frontend reporting components (nice to have). • Want to influence the technical vision and help shape new projects within the ecosystem. • Know English at B2 level or higher. What's in it for you • Well-equipped offices, including kitchens, bicycle parking, green terraces, raised desks, ergonomic chairs and interactive conference rooms. • A 16-inch or 14-inch MacBook Pro, or a corresponding Dell computer with Windows, plus necessary accessories. • Cafeteria-plan benefits, including medical, sports and lunch packages, insurance and purchase vouchers. • Employer-funded English classes related to the role. • Training budget, inter-team tourism, hackathons and an internal learning platform. • An additional day off for volunteering. • Social events, including Spin Kilometers, Family Day, Fat Thursday and Advent of Code. Working environment • Join a team of specialists focused on sharing knowledge and experience. • Autonomy in team organization, continuous development and space to try new approaches. • Choose technologies that solve problems and take responsibility for delivered solutions. • Work with a self-service internal ecosystem and tools including Kubernetes, Docker, Consul, GitHub and GitHub Actions. • Use modern AI tools to automate repetitive work and focus on new and existing services. • Build solutions used by millions of customers. • Work at scale with more than 1,000 microservices, an open-source Hermes data bus handling more than 300K rps, a service mesh handling more than 1M rps, tens of petabytes of data and production machine learning. • Opportunities to participate in conferences, technology communities, blogs, podcasts, guilds and an internal technology conference.

🏢 Summary: Join a Product Catalog engineering team to build and optimize duplicate-detection and product-grouping solutions at scale. The role focuses on backend services, APIs, automation, and architecture in a JVM and public-cloud environment, with hybrid work in Toruń and a salary range of PLN 14,600–20,825. 🗂️ Requirements: Commercial Kotlin experience, Backend architectural patterns, Polish proficiency — C1, English proficiency — B2 📃 Skills: Java, Kotlin, JVM, APIs, Kubernetes, Docker, Consul, GitHub, Hermes, Cloud 🏢 Description: Software Engineer 2 (Java / Kotlin) - Product Catalog Location: Toruń, PL, 87-100 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee About the job In this role, you will be a key player in evolving our Product Catalog - the foundational pillar of our platform. Your primary objective will be to build and optimize solutions for duplicate detection and accurate product grouping across a broad portfolio of system components. Your work will directly shape the daily experience of our users. You will ensure Buyers enjoy a high-quality, clutter-free shopping experience, while helping Partners list their products more efficiently. Expect to tackle exciting technical challenges at scale, working with a diverse tech stack that includes online JVM services and offline processing in a public-cloud environment. 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 Toruń. What You'll Do: Design, develop, test and maintain high-quality code for backend services, APIs and automation scripts. Debug and resolve software defects and issues. Design and develop new project architectures while proposing better architectural approaches for existing solutions. Share knowledge with team members and support junior engineers. Collaborate with product managers, data analysts, UX designers and fellow engineers to gather and refine requirements. Support on-call engineers by participating in the Software Engineer role on-call rotation. Write clean, efficient  and well-documented code. We are looking for someone who has: Solid commercial experience in Kotlin development and a strong command of backend architectural patterns. Language proficiency in Polish at a C1 level and English at a B2 level. Excellent problem-solving and decision-making skills, paired with a Data-Driven mindset. High learning agility, adaptability to change, flexibility  and strong skills in communication and cooperation. 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: Build and scale backend microservices for the Allegro Merchant AI Assistant, delivering real-time, data-driven support under high traffic. The role uses Java or Kotlin, Spring Boot and Kafka, with opportunities to work on LLM-based agents, prompt engineering and AI-enabled services in a hybrid work model. 🗂️ Requirements: Java or Kotlin proficiency, Spring Boot experience, Kafka experience, Backend microservices experience, English proficiency at B2 level 📃 Skills: Java, Kotlin, SpringBoot, Kafka 🏢 Description: Software Engineer 2 (Java / Kotlin) - Allegro Merchant AI Assistant Location: Poznań, PL, 61-569 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee About the job In Merchant Experience we holistically handle our Merchant processes. From acquiring new Partners, through their registration, verification and account setup, publication and editing of listings, order management, sale statistics delivery and payment and pricelist management, to API integrations. Every day, we deal with challenges related to heavy traffic, large data volumes and solution scaling, so as to meet the needs of Partners and the business. Join the Merchant Experience Team! You will have a chance to build Allegro Merchant AI Assistant – one of the most innovative products on the platform. Your team works closely with other teams, creating the best experience for customers. High performance, engineering best practices and a great atmosphere guaranteed! 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 Kotlin or Java and have experience with Spring Boot and Kafka to build robust backend systems; Are enthusiastic about AI and want to stay at the forefront of technical innovation; Want to build impactful tools that power our AI Merchant Assistant, driving the end-to-end development of robust, highly scalable microservices to deliver real-time, data-driven support under high user traffic; Know how to use LLM models to create agents (automation, conversations), or want to develop in this area; Know techniques of prompt engineering and how to evaluate the quality of LLM models , or want to develop in this area; Experience with frontend technologies (React/TypeScript) is a “Nice to have” to help build modern frontend reporting components; Are excited to join a growing team where they can influence the technical vision and help shape new projects from the ground up within the ecosystem; Know English at least at 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: Junior Backend/Mobile Software Engineer role focused on Listings and Filters for iOS and Android apps used at scale. The position combines backend development in Kotlin/JVM, Spring Boot and GraphQL with learning and contributing to native Android or iOS development, including end-to-end feature delivery. 🗂️ Requirements: 2+ years of commercial software engineering experience, Solid backend development foundation, Strong backend engineering skills, Readiness to work with Kotlin and JVM, Commitment to native mobile development, Polish language proficiency at B2 level 📃 Skills: Kotlin, JVM, Spring, GraphQL, iOS, UIKit, SwiftUI, Android, Compose, Kubernetes, Docker, Consul, GitHub 🏢 Description: About the job Join the Listings (Mobile Apps) team as a Junior Software Engineer (Backend / Mobile). You will contribute to the critical path of iOS and Android applications, working on Listings and Filters features used by millions of users. The team is migrating backend services to Kotlin and the JVM while building a next-generation shopping experience that adapts the UI to user needs and uses technologies such as LLMs to improve search results and product selection. Your mission is to accelerate experimentation and deployment in mobile apps by combining backend expertise with an interest in mobile development. You will work with Kotlin, Spring Boot 4, and Spring GraphQL to provide data and build application UI on the backend, while spending a significant part of your time developing Android and/or iOS skills. The role offers end-to-end ownership of features delivered to mobile apps in an evolving technical environment. Important information - Flexible working hours in a 4/1 hybrid model; start between 7:00 a.m. and 10:00 a.m. - 30 days of occasional remote work. - Salary range: PLN 11,200–15,250, depending on skills, under an employment contract with tax-deductible costs. - Annual bonus based on individual performance and results. Requirements - At least 2 years of commercial software engineering experience with a solid backend-development foundation. - Strong backend skills; backend engineering is the core of the technical assessment. - Readiness to work with Kotlin and the JVM ecosystem. - Passion for mobile apps and commitment to learn and work with native mobile technologies: iOS/UIKit/SwiftUI or Android/Jetpack Compose. - Open-mindedness, flexibility, and willingness to learn and adapt in a transforming environment. - Proactive problem-solving approach and ambition to take end-to-end ownership of mobile-app functionality. - Polish proficiency at B2 level or higher. Nice to have - Commercial exposure to iOS or Android development. - Ability to adapt as the team structure and technology stack evolve. - Interest in AI-native capabilities and modernization of high-traffic services. Benefits - Well-equipped offices, including kitchens, bicycle parking, green terraces, raised desks, ergonomic chairs, and interactive conference rooms. - Choice of a 16-inch or 14-inch MacBook Pro, or a Dell Windows laptop, with required accessories. - Cafeteria benefits plan, including medical, sports, lunch, insurance, and purchase-voucher options. - Job-related English classes. - Training budget, inter-team initiatives, hackathons, and an internal learning platform. - An additional volunteering day off. - Social events. Working environment and technology - Work with experienced specialists in a team that shares knowledge and experience. - Autonomy in team organization, continuous development opportunities, and responsibility for technology choices and delivered solutions. - Internal self-service ecosystem using Kubernetes, Docker, Consul, GitHub, and GitHub Actions. - Modern AI tools to automate repetitive tasks and support development and refinement of services. - Work at scale with more than 1,000 microservices, an open-source Hermes data bus processing 300K+ requests per second, a service mesh processing 1M+ requests per second, tens of petabytes of data, and production machine learning.

🏢 Summary: Join an Advertising team to build and operate high-availability backend microservices and ML-serving infrastructure for a large real-time marketplace. The role uses Kotlin, Spring, Kafka, Kubernetes, BigQuery, and Spark to solve distributed-systems, streaming, and algorithmic challenges. It offers hybrid work in Poznań, flexible hours, performance bonus, and extensive development benefits. 🗂️ Requirements: Kotlin or Java programming, Willingness to master Kotlin, High-quality code review practices, Software engineering best-practice knowledge, Ability to solve user requirements effectively, Continuous learning mindset, English at B2 level or higher 📃 Skills: Kotlin, Java, Spring, Kafka, Kubernetes, BigQuery, Spark, Docker, Consul, GitHub, ML 🏢 Description: 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. Our core technologies include Kotlin, Spring, Kafka, and Kubernetes. We're not shy when it comes to ML too :) 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. End-to-End ML Systems: Bridge the gap between big data and real-time product impact. You’ll build the infrastructure for serving ML models , using BigQuery and Apache Spark for offline data processing. You’ll integrate these components with our microservices architecture to create the sophisticated advertising system that powers a personalized user experience. Join the Advertising team! You will have a chance to build Allegro Ads - one of the most visible products on the platform. Your team works closely with the Machine Learning team, creating the best experience for customers. High performance, engineering best practices and great atmosphere in the team guaranteed! 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 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Poznań. We are looking for people who: Code in Kotlin or Java and are eager to master Kotlin by taking part greenfield project 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; Are excited about building new products and want to experience the journey of launching a fresh project within the Allegro ecosystem; Are open to developing soft skills and embracing a growth mindset through active participation in code reviews, pair programming, and team retrospectives.; Are open to incorporating AI coding assistants into their daily work to maximize efficiency and focus on complex problem-solving 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. 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 backend engineering role focused on designing, optimizing, and operating highly available checkout and purchase-path services at massive scale. The position involves end-to-end ownership of cloud-native microservices, business collaboration, on-call reliability, LLM-based tool development, and mentoring less experienced developers. 🗂️ Requirements: 5+ years building and maintaining complex, highly scalable systems, Java proficiency, Kotlin proficiency, Reactive programming experience, Experience collaborating with Product Managers and analyzing business requirements, Experience cooperating with technical teams, Readiness for structured on-call rotation 📃 Skills: Java, Kotlin, Reactive, GCP, Spring, MongoDB, Microservices, Airflow, Kubernetes, Docker, Consul, GitHub, LLM 🏢 Description: About the job: At Allegro, we operate at a massive scale where performance and reliability are paramount. Within the Razor team, we maintain the critical backend infrastructure for the entire checkout and purchase path. Our service acts as the central hub, providing essential offer data to nearly 60 critical services - including Show Product, Listings, and Cart - across mobile, web, and desktop. Operating on nearly 500 instances and handling traffic of up to 50,000 requests per second, this high-throughput environment demands exceptional focus on high availability, Java performance optimization, and scalable architecture. 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 Toruń. What You'll Do: Massive Scale : Design, build, and optimize systems that handle thousands of requests per second. This is high-availability, high-performance engineering in practice. Master advanced technologies : Work in a world-class, cloud-native environment (GCP). Our core technologies include Java, Kotlin, Spring, MongoDB, microservices, and Airflow (Big Data). True Ownership & Autonomy : We live by the "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your microservices—from design to deployment. Engage with diverse business initiatives: Partner with PMs to analyze requirements and drive numerous business initiatives across Allegro. Drive innovation with LLM: Participate in the development of new tools based on Large Language Models. Work with an experienced team: Benefit from a high-agency environment with support and development opportunities provided by senior experts. As a senior developer, you will also have the opportunity to share your knowledge and mentor colleagues with less experience. Ensure system reliability: Maintain the stability of complex architectures through participation in on-call duty. We are looking for people with: Commercial experience: 5 years of experience in building and maintaining complex, high-scalability systems. Strong technical foundation: Proficiency in Java (primary) and Kotlin, with a focus on reactive programming. Advanced database skills (nice to have): Hands-on experience and advanced knowledge of MongoDB. Business-oriented mindset: Experience in collaborating with Product Managers and analyzing business requirements. Team collaboration skills: A track record of frequent cooperation with other technical teams to deliver shared goals. Reliability and ownership: Readiness to participate in a structured on-call rotation to ensure system stability. What's in it 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. 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: Backend engineering role on a logistics mobile team, building high-availability, scalable services that support delivery operations and mobile workers. The position offers end-to-end ownership of C#/.NET services, from design through deployment, in a hybrid work model with a PLN 14,600–20,825 salary range and annual bonus. 🗂️ Requirements: C# proficiency, Experience with .NET Core and ASP.NET, Experience building high-performance backend services, Experience designing scalable REST APIs, Experience with relational databases and SQL, Experience with PostgreSQL and Entity Framework, Experience with Docker and Kubernetes, Experience with Azure Service Bus or another message broker, Experience using Redis for caching and performance tuning, Full software development lifecycle ownership, English proficiency at B2 level or higher 📃 Skills: C#, .NET, ASP.NET, REST, PostgreSQL, SQL, EntityFramework, Docker, Kubernetes, Azure, Redis, SOAP, WCF, Consul, GitHub 🏢 Description: Software Engineer 2 (.NET/C#) - Logistics team Location: Warszawa, PL, 00-841 Company: Opennet.pl Sp. z o.o. Team: Technology Contract Type: Employee About the job: We are part of Allegro and we are specialists in providing advanced IT systems for logistics management Massive Scale : Design and build high-availability systems used by tens of thousands of users. This is high-performance engineering in practice. Modern Tech Stack : Work with a world-class environment using C#, .NET Core, ASP.NET , REST, PostgreSQL, Azure, Docker, Kubernetes, EntityFramework, and Redis. 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 the services you create, from design to deployment. Complex Challenges : You will tackle complex backend problems, using technology to solve real-world business challenges. Join the logistics’ mobile team! You will have a chance to accelerate Allegro’s One logistics operations through mobile apps serving all various groups of workers: from couriers, warehousemen, truck drivers up to APMs’ installers and servicemen. You will have a chance to build the systems powering our logistics infrastructure. Your team works to streamline the critical operations that power the final stages of our delivery network. We prioritize high performance and a great team atmosphere. We are currently evolving our engineering practices, and this role is an excellent opportunity to actively contribute to the backend team’s growth. 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 proficient in C# and .NET Core / ASP.NET , with experience in building high-performance backend services; Have solid experience in designing scalable REST APIs ; Have solid experience with RDBMS (e.g., PostgreSQL) and ORM tools like Entity Framework ; experience with other relational databases is also highly valued, as SQL knowledge is key; Are comfortable working in a cloud-native environment with Docker, and Kubernetes ; Have experience working with Azure Service Bus or other message broker systems, to handle asynchronous communication; Know how to utilize Redis for efficient caching and performance tuning; Have an understanding of the challenges backend systems face when supporting mobile applications, as your work will be critical for our mobile platform (an additional advantage); Are eager to actively contribute to our backend team's growth by helping us shape and refine our engineering best practices; Take full ownership of your code – you enjoy being involved in the full software development lifecycle; Are excited to join a growing team where they can influence the technical vision and help shape new projects from the ground up within the ecosystem; You have a pragmatic approach to legacy components (e.g., SOAP/WCF ); you are comfortable with them when necessary, though this accounts for only a minor portion of your daily work. 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" Dell with Windows 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: Join a fintech engineering team building high-scale purchase-financing and payment solutions used by millions of customers. The role offers hybrid work, PLN 11,200–15,250 salary on an employment contract, an annual bonus, and modern development tooling. You will develop stable .NET services, learn distributed architecture, and work in a mature microservices environment. 🗂️ Requirements: At least 1 year of .NET software development experience, including internships, English proficiency at B2 level, Willingness to learn distributed-system architecture, Ability to find efficient solutions for user needs, Participation in code reviews and openness to feedback 📃 Skills: .NET, SQL, CosmosDB, Azure, Kubernetes, Docker, Consul, GitHub, Copilot, OpenCode 🏢 Description: About the job: Allegro Pay is Central Europe’s largest and fastest growing fintech – the only place where financial solutions can be created on such a large scale, using state-of-the-art technology. We work on purchase financing and payment methods that are used daily by customers of Allegro, the most popular shopping platform in Poland and one of the largest e-commerce companies in Europe. Due to this scale, we have the opportunity to work on one of the most exciting purchase financing and payment solutions in our country. We are looking for talented people who want to create powerful and stable solutions to support a product with over a dozen million active users. 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 PLN 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Kraków Here's why you should join us: AI-Adoption strategy: we invest a lot of effort to upskill our specialists and equip them with the newest AI coding technologies like Copilot or OpenCode. Big Scale: Immerse yourself in the exciting world of Allegro Pay, where your .NET skills will tackle challenges on a large scale. You'll be contributing to financial solutions that affect over 2.5 million people (handling 60+ million requests daily and managing dozens of terabytes of data) Engineering Maturity: Join a culture that mirrors the top tech giants. Our commitment to engineering excellence and maturity puts us on par with industry leaders like FAANG companies. (11 of 12 in Pragmatic Engineer Score) Best-in-Class Expertise: Work alongside the best experts in the field, collaborating to push the boundaries of what's possible in FinTech. Our team includes MVPs and many conference speakers Impactful Products: Imagine this – your work at Allegro Pay contributes to creating products that you, your family, and friends might already use daily. See the direct impact of your efforts on the FinTech landscape (with 120+ deployments per month) We are looking for people who: Have at least one year of experience in .NET as a Software Developer, including internships Are willing to learn how to design distributed system architecture Want to be proud of the code they write but also willing to accept feedback and share their knowledge during code reviews Can search for efficient solutions to meet users’ needs Are eager to continuously develop their skills and expand their knowledge Know English at B2 level The following are also a plus: Knowledge of SQL, CosmosDB, Azure, Event Sourcing and Kubernetes 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: Mobile Software Engineer role focused on building high-performance native Android experiences that improve user loyalty and mobile app features. The offer includes hybrid work, a PLN 14,600–20,825 salary range, an annual bonus, and development-oriented benefits. 🗂️ Requirements: 3+ years of native Android application development experience, Kotlin, Mobile architecture patterns (MVVM, MVI, Clean Architecture), RESTful APIs, Asynchronous programming and efficient data handling, Unit and integration testing, Git or equivalent version control, Software engineering principles, data structures, and algorithms, CI/CD pipelines, English and Polish communication skills 📃 Skills: Android, Kotlin, MVVM, MVI, REST, Git, CI/CD 🏢 Description: About the job: As a Mobile Software Engineer, you will be a key contributor to initiatives focused on enhancing user loyalty, including Smart! and related improvements for our mobile applications. You will work closely with product owners, designers, and other engineers to translate user needs into robust, high-performance mobile experiences. This role is ideal for someone with solid experience in mobile development, a strong understanding of software engineering principles, and a desire to grow their expertise in a fast-paced e-commerce environment. 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 someone who has: 3+ years of professional experience in native Android (Kotlin) mobile application development. Understanding of mobile application architecture patterns (e.g., MVVM, MVI, Clean Architecture). Familiar with RESTful APIs, asynchronous programming, and efficient data handling. Proficiency in writing unit and integration tests. Familiarity with version control systems (e.g., Git). Understanding of software engineering principles, data structures, and algorithms. Experience with continuous integration and continuous delivery (CI/CD) pipelines. Good communication skills in English and Polish, both written and spoken. A proactive approach to problem-solving and a passion for creating excellent user experiences. Bonus points if you have: Experience with large-scale, high-traffic mobile applications. Familiarity with Jetpack Compose and Coroutines. Experience with A/B testing frameworks. Contributions to open-source projects or a strong GitHub profile. Experience working in an Agile/Scrum environment. 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!