Senior Software Engineer (Java / Kotlin) - Operations Automation

🏢 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: 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: Software Engineer 1 (Java / Kotlin) - AI Assistant Location: Poznań, PL, 61-569 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee About the job: In Partner Experience we holistically handle our Partner 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 Partner Experience Team! You will have a chance to build Allegro Partner AI Assistant - one of the most innovative products on the platform. Your team works closely with other engineering teams, 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 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 Partner 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: Test Automation Engineer role focused on improving SDLC quality and delivery speed through automated end-to-end and manual backend/API testing. The position involves designing, maintaining, and executing tests, reporting defects, and collaborating throughout the product development cycle. It offers hybrid work, flexible hours, performance-based bonus, and development benefits. 🗂️ Requirements: Basic practical experience or strong foundational knowledge of Java, Knowledge of backend automation frameworks, Understanding of REST APIs and microservices, Knowledge of HTTP methods, JSON/XML, status codes, and API testing tools, Basic SQL and database knowledge, Manual API/backend testing capability, Attention to detail and system-level data-flow perspective, English and Polish at B2 level or higher 📃 Skills: Java, REST, JUnit, TestNG, Postman, SQL, HTTP, JSON, XML, Microservices 🏢 Description: Job Description: Test Automation Engineers at Allegro are critical to ensuring the highest quality of SDLC processes and products delivered by the team. This role is essential for reducing the time required for thorough development testing by developing automated E2E tests and performing manual tests to identify typical and edge-case use cases. By providing testing support and delivering tools that streamline the testing process, you will directly impact the speed and quality of delivering business solutions. 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. In your daily work you will handle the following tasks: Supporting the design and implementation of automated tests within the technology stack agreed upon with the team, while also executing and maintaining them. Creating and performing manual tests and collaborating with the team to define test criteria during new feature development. Actively participating in the entire product development cycle to help identify edge cases, mutually exclusive requirements, or logic gaps. Reporting identified bugs and supporting backlog prioritization to ensure platform stability. Maintaining the appropriate level of Quality Assurance within the team, particularly in SDLC processes. Collaborating with Software Engineers regarding test status reporting and with other Test Engineers within the domain. Writing clean, easy-to-read, and easy-to-debug code while contributing to the definition of Ready (DoR) and Definition of Done (DoD). Acting as a "customer ambassador" – continuously evaluating the team’s work from the end-user's perspective. This is the right job for you if: Have basic practical experience or strong foundational knowledge of Java and backend automation libraries/frameworks (e.g., REST Assured, JUnit, TestNG). Understand how REST APIs and microservices work (comfortable with HTTP methods, JSON/XML, status codes, and API tools like Postman). Have a basic understanding of databases (SQL) and how backend systems process and persist data. See manual API/backend testing as the best way to truly understand a service before you start writing code to automate it. Want to be proud of the code you write, are open to feedback (code reviews), and willing to share your knowledge. Possess a keen eye for detail and a system-level, data-flow perspective rather than just a single-feature focus. Are eager to continuously develop your skills in a modern Java backend environment. Know English and Polish at B2 level or higher. 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. 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, 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. #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. 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, and tens of petabytes of data. You will become part of Allegro Tech – we speak at conferences, run our own blog, record podcasts, and organize our own internal conference – the Allegro Tech Meeting. Send us your CV and... see you at Allegro!

🏢 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: 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: We are seeking a talented, open-minded, and ambitious Junior Software Engineer (Backend / Mobile) to join our Listings (Mobile Apps) team. You won't just be writing code for the sake of it; you'll be a key contributor to the critical path of our iOS and Android apps, directly impacting millions of users through our Listings and Filters features. The team is currently driving a massive transformation, migrating our backend services to Kotlin and JVM, while building a next-generation shopping experience that will adapt the UI to users’ needs and use cutting-edge technologies (e.g. LLMs) to refine their search results and help them select the perfect product on our shopping platform. Your mission? To accelerate experimentation and deployment in our mobile apps by combining strong backend capabilities with a passion for mobile development. You’ll get a unique opportunity to dive deep into Kotlin, Spring Boot 4, and Spring GraphQL by providing data and building application UI on the backend, while dedicating a significant part of your time to mastering mobile technologies (Android and/or iOS). Our team is highly experienced, and we are looking for someone who brings fresh ideas, a hunger to learn, and the flexibility to adapt to a changing tech landscape. If you're itching to take end-to-end ownership of features and want to tie your professional future to the dynamic world of mobile app development, you've found the right place. 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 have: At least 2 years of commercial experience in software engineering, with a solid foundation in backend development Strong backend skills (this will be the core of our technical assessment) and a readiness to work with Kotlin and the JVM ecosystem A genuine passion for mobile apps and a strong commitment to learn and work with native mobile technologies (iOS/UIKit/SwiftUI or Android/Jetpack Compose) An open mind, flexibility, and a hunger for learning - we value fresh perspectives and the drive to adapt to a transforming environment A proactive approach to problem-solving and the ambition to take end-to-end ownership of functionalities delivered to mobile apps Fluency in Polish (at least B2 level). Nice to have: Previous commercial exposure to mobile technologies (iOS or Android) is a massive win A future-proof mindset, ready to pivot and adapt as our team's structure and tech stack evolve Excitement for working with AI-native capabilities and modernizing high-traffic services 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: 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: Junior Software Engineer role on a centralized Notifications Platform, building and scaling low-latency, highly concurrent distributed backend services. The offer provides end-to-end ownership, hybrid work, a PLN 11,200–15,250 gross salary range, annual bonus, and development benefits. 🗂️ Requirements: Kotlin or Java programming, Willingness to use Kotlin in production, Microservices architecture fundamentals, Scalable, resilient systems knowledge, End-to-end initiative ownership, Stakeholder communication, English B2 or higher 📃 Skills: Kotlin, Java, Microservices, React, Kubernetes, Docker, Consul, GitHub, GitHubActions, Hermes, AI 🏢 Description: Junior Software Engineer - Notifications Platform Location: Kraków, PL, 31-503 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee Our ecosystem is growing fast and communication is at the heart of it. We are building a centralized Notifications Platform with an architecture capable of handling massive scale, processing absolutely every single message and alert routed through our system. We need a Software Engineer (Java/Kotlin) who can jump straight into the action, take ownership of highly concurrent distributed services and help us ensure rock-solid, low-latency delivery. No corporate fluff - just real engineering challenges and system-wide impact. About the job Own the architecture: You will design and scale backend services capable of handling complex business accounts and high transaction volumes. Ship real product: You’ll collaborate with the team to turn complex requirements into clean, working software. Keep it rock-solid: You’ll ensure our critical services run smoothly and reliably (and yes, in time, help us keep our on-call rotation healthy). 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 gross 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Kraków and Warsaw. We are looking for someone who: Code in Kotlin or Java and are excited to master Kotlin in a production environment. Are open to diverse technologies , including Frontend (but you don’t need to be a React master:)) 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 foundation in microservices architecture, 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!