Mid Java Developer

🏢 Summary: Senior Java Developer role focused on designing and owning mission-critical backend systems in fintech and high-scale environments. The position involves leading microservices architecture, optimizing performance and reliability, and mentoring engineers. Full-time onsite work in Warsaw with strong emphasis on architectural quality and production-grade systems. 🗂️ Requirements: Full-time onsite availability in Warsaw, 5+ years commercial experience in Java development, Strong commercial experience with Java and Spring (Boot, Security, Data), Deep knowledge of Hibernate ORM and SQL databases, Strong understanding of JVM internals, Experience designing scalable backend architectures, Proficiency with CI/CD pipelines, Proficiency with Git, Proficiency with Gradle, Experience with production debugging, Ability to use AI-assisted development tools, English level B2 or higher 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SpringData, Hibernate, SQL, JVM, PostgreSQL, CI/CD, Git, Gradle, REST, SOLID, DDD, ChatGPT, Claude, Cursor, Grok 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B / Freelance About Silk Software House Silk Software House builds and maintains mission-critical backend systems for fintech, payments, and large-scale platforms. We value strong engineering judgment, ownership, and long-term cooperation over short-term delivery pressure. Your Role As a Senior Java Developer, you’ll take technical ownership of backend services, influence architectural decisions, and mentor other engineers. You’ll work directly on complex domains where performance, security, and reliability matter. Responsibilities Design and implement backend architectures using Java 11+ and Spring Lead development of microservices and APIs Optimize performance, scalability, and data consistency Work deeply with Hibernate , transactions, and database internals Review code, mentor developers, and set engineering standards Collaborate with DevOps on deployments and observability Requirements This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 5+ years of commercial experience as a Java Developer Strong commercial experience with Java & Spring (Boot, Security, Data) Deep knowledge of Hibernate ORM , SQL databases, and JVM behavior Experience designing scalable, maintainable backend architectures Proficiency with CI/CD, Git, Gradle, and production debugging Effective use of AI-assisted development tools ( ChatGPT, Claude, Cursor, Grok ) English at B2+ level Nice to Have Event-driven architecture (Kafka, queues) Cloud-native systems (AWS/GCP/Azure) Kubernetes, Docker, observability tools Experience in fintech or high-traffic systems Rates (B2B) 120–160 PLN / hour Recruitment Process Intro call (30 min) Senior-level technical interview Architecture & project discussion Offer Tech Stack Java: Advanced Spring Boot: Advanced Hibernate: Advanced PostgreSQL: Advanced Solid: Advanced DDD: Advanced REST API: Advanced

🏢 Summary: Senior Java Developer role focused on designing and owning high-performance backend systems for fintech and large-scale platforms. The position involves leading microservices architecture, optimizing performance and data consistency, and mentoring engineers in a full-time onsite setup in Warsaw. Strong emphasis on architectural decision-making, security, and reliability in production environments. 🗂️ Requirements: 5+ years commercial experience as Java Developer, Strong commercial experience with Java and Spring (Boot, Security, Data), Deep knowledge of Hibernate ORM and SQL databases, Strong understanding of JVM behavior, Experience designing scalable backend architectures, Proficiency with CI/CD pipelines, Proficiency with Git and Gradle, Experience with production debugging, Ability to work full-time onsite in Warsaw, Effective use of AI-assisted development tools (ChatGPT, Claude, Cursor, Grok), English level B2+ or higher 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SpringData, Hibernate, SQL, PostgreSQL, JVM, CI/CD, Git, Gradle, REST, SOLID, DDD, ChatGPT, Claude, Cursor, Grok 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B / Freelance About Silk Software House Silk Software House builds and maintains mission-critical backend systems for fintech, payments, and large-scale platforms. We value strong engineering judgment, ownership, and long-term cooperation over short-term delivery pressure. Your Role As a Senior Java Developer, you’ll take technical ownership of backend services, influence architectural decisions, and mentor other engineers. You’ll work directly on complex domains where performance, security, and reliability matter. Responsibilities Design and implement backend architectures using Java 11+ and Spring Lead development of microservices and APIs Optimize performance, scalability, and data consistency Work deeply with Hibernate , transactions, and database internals Review code, mentor developers, and set engineering standards Collaborate with DevOps on deployments and observability Requirements This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 5+ years of commercial experience as a Java Developer Strong commercial experience with Java & Spring (Boot, Security, Data) Deep knowledge of Hibernate ORM , SQL databases, and JVM behavior Experience designing scalable, maintainable backend architectures Proficiency with CI/CD, Git, Gradle, and production debugging Effective use of AI-assisted development tools ( ChatGPT, Claude, Cursor, Grok ) English at B2+ level Nice to Have Event-driven architecture (Kafka, queues) Cloud-native systems (AWS/GCP/Azure) Kubernetes, Docker, observability tools Experience in fintech or high-traffic systems Rates (B2B) 120–160 PLN / hour Recruitment Process Intro call (30 min) Senior-level technical interview Architecture & project discussion Offer Tech Stack Java: Advanced Spring Boot: Advanced Hibernate: Advanced PostgreSQL: Advanced Solid: Advanced DDD: Advanced REST API: Advanced

🏢 Summary: Mid PHP Developer role focused on building and maintaining web applications, REST APIs, and backend services using modern PHP frameworks. The position involves developing new modules, integrating systems, and ensuring production-ready, testable code within an onsite team environment. This is a full-time B2B role based in Warsaw. 🗂️ Requirements: 3–5 years of commercial experience in PHP projects, Very good knowledge of PHP 8+, Practical experience with Symfony or Laravel, Good knowledge of MySQL or PostgreSQL, Understanding of object-oriented programming, Knowledge of design patterns, Ability to write automated tests, Knowledge of application security fundamentals, Familiarity with Git, Understanding of CI/CD concepts, Basic understanding of Docker, Full-time onsite availability in Warsaw 📃 Skills: PHP, Symfony, Laravel, MySQL, PostgreSQL, REST, OOP, DesignPatterns, Git, CI/CD, Docker, Security, Testing 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona)💼 B2B About Silk Software House Silk Software House is a Warsaw-based development company delivering high-quality fintech, e-commerce, and enterprise systems for long-term clients. We focus on clean architecture, pragmatic engineering, and building software that runs reliably in production. Your Role As a Mid PHP Developer, you’ll work on existing and new web applications, APIs, and internal systems. You’ll implement features, collaborate with the team, and grow toward greater ownership of system components. Responsibilities Develop and maintain web applications and backend services in PHP Work with Symfony or Laravel frameworks Design and maintain REST APIs and system integrations Implement new modules for existing systems Work with relational databases ( MySQL, PostgreSQL ) Write clean, testable, production-ready code Collaborate with frontend, QA, and DevOps teams Requirements This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 3–5 years of commercial experience in PHP projects Very good knowledge of PHP (8+) Practical experience with Symfony or Laravel Good knowledge of relational databases ( MySQL/PostgreSQL ) Understanding of object-oriented programming and design patterns Ability to write automated tests General knowledge of application security (common threats and protections) Familiarity with Git and basic CI/CD concepts Basic understanding of Docker (what it is and how it’s used) English at B2 level or higher Nice to Have Experience with CMS systems Basic frontend knowledge (HTML, CSS, JS) Monitoring basics (what to log, what not to log) Experience with GitLab or GitHub CI/CD pipelines Rates (B2B) 80–110 PLN / hour Recruitment Process Intro call (30 min) Technical interview or short task Final fit & project discussion Offer

🏢 Summary: Onsite Fullstack Developer role focused on building scalable, production-ready web applications using Java Spring and Node.js on the backend and React on the frontend. The position involves developing REST APIs, integrations, and high-performance systems with relational databases, contributing to architecture and technical decisions. Work is 100% onsite in Warsaw under a B2B contract. 🗂️ Requirements: Ability to work 100% onsite in Warsaw, Commercial experience with Java, Commercial experience with Spring Boot, Commercial experience with Node.js, Experience with React, Experience with TypeScript, Knowledge of PostgreSQL, Knowledge of MySQL, Knowledge of MariaDB, Experience building production applications, Understanding of REST APIs, Understanding of backend architecture, English B2 level or higher 📃 Skills: Java, Spring, SpringBoot, Node.js, NestJS, Express, React, Next.js, TypeScript, PostgreSQL, MySQL, MariaDB, REST, Git, Docker, CI/CD 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B About Silk Software House We build modern, scalable applications with fintech-grade reliability and strong backend architecture. Our projects focus on high-performance web platforms and integrations using Java Spring and Node.js ecosystems. Your Role As a Fullstack Developer, you’ll primarily work with Java Spring and Node.js on the backend, and React on the frontend. You’ll collaborate closely with backend and frontend engineers to deliver scalable production-ready applications. Responsibilities Develop backend services using Java / Spring Boot and Node.js (NestJS / Express) Build frontend applications with React / Next.js + TypeScript Design and maintain REST APIs and integrations Work with relational databases including PostgreSQL, MySQL, and MariaDB Collaborate with designers, backend developers, and product teams Participate in architecture and technical decision-making Maintain and improve production applications Requirements Ability to work 100% onsite from our office near Metro Plac Wilsona, Warsaw Commercial experience with Java / Spring Boot, Node.js backend development Experience with React + TypeScript Good knowledge of relational databases (PostgreSQL, MySQL, MariaDB) Experience building and maintaining production applications Understanding of API integrations and backend architecture English at least B2 level Nice to have Experience with microservices architecture Cloud deployment experience CI/CD knowledge Docker and containerization experience Experience with scalable backend systems Tech Stack Area: Technologies Backend: Java Spring Boot, Node.js, NestJS, Express Frontend: React, Next.js, TypeScript Databases: PostgreSQL, MySQL, MariaDB DevOps: Docker, CI/CD Tools: Git, REST APIs Recruitment Process 1. Intro Call – Quick chat about your experience, expectations, and our projects 2. Technical Interview / Task – Backend and frontend discussion focused on Java Spring, Node.js, and React 3. Final Meeting – team fit and project discussion 4. Fast feedback after each stage within a few days. 5. Process usually takes 2–3 weeks .

🏢 Summary: Fullstack Developer role focused on building and maintaining production-grade backend services in Node.js (NestJS/Express) and frontend applications in React/Next.js with TypeScript. The position involves working with databases and APIs to deliver long-term fintech, e-commerce, and enterprise systems. Onsite work in Warsaw with a strong emphasis on backend expertise and production experience. 🗂️ Requirements: Strong backend skills in Node.js and NestJS, Minimum 5 years of experience in backend development, Minimum 2 years of experience maintaining production applications, Solid frontend skills in React and TypeScript, Experience with database integration, Experience with API integration, Experience mentoring mid or junior developers, Ability to work 100% onsite in Warsaw 📃 Skills: Node.js, NestJS, Express, React, Next.js, TypeScript, PostgreSQL, MongoDB, APIs, Microservices, Cloud 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B About Silk Software House We build modern, scalable applications with fintech-grade reliability and strong backend architecture. Our projects focus on high-performance web platforms and integrations using Java Spring and Node.js ecosystems. Your Role As a Fullstack Developer, you’ll primarily work with Node.js on the backend, React on the frontend, sometimes also with Next.js Responsibilities Develop backend services with Node.js (NestJS/Express) * Build frontend apps with React/Next.js + TypeScript * Work with databases (PostgreSQL, MongoDB) and APIs Collaborate with design and backend teams Requirements Strong backend skills in Node.js/NestJS At least 5 years of experience in backend applications At least 2 years of experience in maintaining production applications Solid frontend skills in React + TypeScript Database and API integration knowledge Experience mentoring mid/junior developers Ability to work 100% onsite from our office near Metro Plac Wilsona, Warsaw Nice-to-have Microservices and cloud deployment experience Rates (B2B/Freelance) Senior: 120 - 180 PLN/h Recruitment Process 1. Intro Call (30 min) – Quick chat about your experience, expectations, and our projects. 2. Technical Interview / Task – Backend (Node.js) and frontend (React) focus. 3. Final Meeting – Culture/fit + project discussion. 4. Offer – Fast decision if it’s a match. 5. Process usually takes 2–3 weeks . 6. Feedback after each stage within a few days

🏢 Summary: Full-time onsite Mid Frontend Developer role focused on building and maintaining modern web applications using React. The position involves translating Figma designs into pixel-perfect, responsive interfaces and integrating with REST/GraphQL APIs. You will collaborate with backend teams to deliver secure, high-performance frontend solutions. 🗂️ Requirements: Full-time onsite work in Warsaw (near Metro Plac Wilsona), 2–4 years commercial experience with React, Strong knowledge of JavaScript, Strong knowledge of TypeScript, Very good knowledge of HTML5, Very good knowledge of CSS3, Practical experience with TailwindCSS, Experience with state management patterns, Understanding of frontend security basics, Experience testing React components, Familiarity with Git workflows, Basic knowledge of Docker, Ability to use AI tools in development, English level B2+ 📃 Skills: React, JavaScript, TypeScript, HTML5, CSS3, TailwindCSS, REST, GraphQL, Git, Docker, Figma, WCAG, Next.js, Storybook, CI/CD, i18n 🏢 Description: Warsaw (Onsite – near Metro Plac Wilsona)💼 B2B About Silk Software House Silk Software House is a Warsaw-based development company delivering high-quality fintech, e-commerce, and enterprise systems for long-term clients. We focus on clean architecture, pragmatic engineering, and software that performs well in production. Your Role As a Mid Frontend Developer, you’ll design and implement modern web applications using React. You’ll work closely with backend developers and designers, translate Figma designs into pixel-perfect UI, and help maintain and evolve existing products. Responsibilities Design and implement modern web applications using React Build responsive, pixel-perfect UI based on Figma designs Integrate frontend applications with REST / GraphQL APIs Implement authentication and authorization flows Maintain and optimize existing frontend codebases Diagnose performance and rendering issues Collaborate with system architects, backend developers, and other stakeholders Ensure code quality, performance, and maintainability Requirements This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 2–4 years of commercial experience with modern React Strong knowledge of JavaScript and TypeScript Very good understanding of HTML5 and CSS3 Practical experience with TailwindCSS Experience with common state management patterns Good understanding of frontend security basics Basic experience with testing React components Familiarity with Git and standard development workflows Basic understanding of Docker Ability to use AI tools as part of the development workflow English at B2+ level with good communication skills Nice to Have Internationalization ( i18n ) E2E tests CI/CD pipelines Accessibility standards ( WCAG ) Experience with Next.js Storybook Rates (B2B) 80–110 PLN / hour Recruitment Process Intro call (30 min) Technical interview or short task Final fit & project discussion Offer

🏢 Summary: Full-time onsite Senior PHP Developer role focused on end-to-end backend ownership, from requirements gathering and architecture to implementation and technical decision-making. The position involves building and maintaining business-critical PHP applications, APIs, CMS systems, and data exchange solutions. You will also collaborate with DevOps and mentor other developers while working closely with clients. 🗂️ Requirements: Full-time onsite work in Warsaw (near Metro Plac Wilsona), 5+ years commercial experience as PHP Developer, Very good knowledge of PHP 8.1+, Strong commercial experience with Symfony or Laravel, Deep understanding of relational databases (MySQL or PostgreSQL), Strong knowledge of OOP principles and design patterns, Experience with automated testing, Knowledge of application security and common vulnerabilities, Proficiency with Git and development workflows, Experience working in Agile teams, Ability to independently gather requirements and design technical solutions, Effective use of AI-assisted development tools, English level B2+ 📃 Skills: PHP, Symfony, Laravel, MySQL, PostgreSQL, OOP, Git, Agile, Testing, Security, ChatGPT, Claude, Cursor 🏢 Description: Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B About Silk Software House Silk Software House builds and maintains business-critical backend and web systems for fintech, payments, and large-scale platforms. We value ownership, strong engineering judgment, and the ability to design solutions, not just implement tickets. Your Role As a Senior PHP Developer, you’ll take ownership of backend solutions end-to-end: from gathering requirements, through architecture and implementation, to explaining and defending technical decisions. You’ll work closely with clients and mentor other developers. Responsibilities Design and develop PHP applications from scratch Gather requirements and propose well-reasoned technical solutions Design and maintain APIs, internal services, and data exchange systems Design and implement CMS systems Create new modules and evolve existing systems Make architectural decisions and evaluate alternatives Review code and support less experienced developers Collaborate with DevOps on deployment, CI/CD, and monitoring Requirement This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 5+ years of commercial experience as a PHP Developer Very good knowledge of PHP 8.1+ Strong commercial experience with Symfony or Laravel Deep understanding of relational databases (MySQL/PostgreSQL) Strong knowledge of OOP principles, design patterns, and coding standards Experience with automated testing and testing concepts Good understanding of application security and common vulnerabilities Solid understanding of Git and software development workflows Experience working in a team using Agile methodologies Ability to independently gather requirements, design solutions, and justify decisions Effective use of AI-assisted development tools ( ChatGPT, Claude, Cursor, etc. ) English at B2+ level Nice to Have Docker and containerized environments CI/CD pipelines (GitLab or GitHub) Monitoring and observability tools Experience in fintech or high-traffic systems Basic frontend knowledge (HTML, CSS, JS) Rates (B2B) 110–140 PLN / hour Recruitment Process Intro call (30 min) Senior-level technical interview Architecture & decision-making discussion Offer

🏢 Summary: Senior Frontend Developer role focused on designing and owning frontend architecture for complex web applications in fintech and enterprise domains. The position involves building advanced React applications with TypeScript, making architectural decisions, and ensuring high performance, security, and code quality. Full-time onsite work in Warsaw with strong collaboration across backend and product teams. 🗂️ Requirements: Full-time onsite availability in Warsaw, 5+ years professional programming experience, Strong commercial experience with React, Excellent knowledge of TypeScript, Deep understanding of React state management and rendering, Very good knowledge of HTML5 and CSS3, Strong experience with TailwindCSS, Experience designing frontend architectures, Experience integrating REST or GraphQL APIs, Knowledge of authentication and authorization flows, Understanding of frontend security and performance optimization, Experience diagnosing performance and rendering issues, Proficiency with Git and professional workflows, Experience working in Agile teams, Ability to use AI-assisted development tools, English level B2+ 📃 Skills: React, TypeScript, HTML5, CSS3, TailwindCSS, REST, GraphQL, Git, Agile, Next.js, WCAG, CICD, Storybook, i18n, Authentication, Authorization, Security, Performance 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona)💼 B2B About Silk Software House Silk Software House builds and maintains business-critical web applications for fintech, payments, and enterprise clients. We value ownership, strong technical judgment, and developers who can design solutions, not just implement tasks. Your Role As a Senior Frontend Developer, you’ll take responsibility for frontend architecture, make key technical decisions, and ensure long-term code quality and performance. You’ll collaborate closely with backend teams and help shape how frontend systems are built and evolved. Responsibilities Design and build frontend architecture for web applications Develop complex React applications using TypeScript Make and justify architectural and technical decisions Optimize performance, rendering, and user experience Define and enforce frontend best practices and coding standards Integrate frontend systems with REST / GraphQL APIs Review code and support less experienced developers Collaborate with architects, backend developers, and product stakeholders Support existing projects through modernization and optimization Requirements This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station 5+ years of professional programming experience , including strong React experience Excellent knowledge of TypeScript Deep understanding of React , state management, and rendering behavior Very good knowledge of HTML5, CSS3 , and responsive design Strong experience with TailwindCSS Solid understanding of authentication and authorization flows Good knowledge of frontend security and performance optimization Experience designing and building frontend architectures Experience diagnosing complex performance and rendering issues Familiarity with Git and professional development workflows Experience working in teams using Agile methodologies Ability to use AI-assisted development tools effectively English at B2+ level , enabling smooth communication Nice to Have Next.js Accessibility standards ( WCAG ) E2E testing frameworks CI/CD pipelines Storybook i18n support in production applications Rates (B2B) 110–140 PLN / hour Recruitment Process Intro call (30 min) Senior-level technical interview Architecture & decision-making discussion Offer

🏢 Summary: IT Project Manager role responsible for end-to-end delivery of software projects (discovery to deployment) in fintech, e-commerce and enterprise domains. The position focuses on managing development teams, coordinating clients, and ensuring high-quality delivery while leveraging AI tools to optimize processes. Onsite work in Warsaw under a B2B contract. 🗂️ Requirements: Onsite work in Warsaw, 2–4+ years IT Project Manager experience, Experience with development teams, Knowledge of SDLC, Managing multiple projects simultaneously, Scope, schedule and budget planning, Risk identification and problem solving, Client communication, English B2 minimum, Use of AI tools in daily work 📃 Skills: SDLC, ProjectManagement, Planning, Budgeting, RiskManagement, SoftwareDevelopment, ChatGPT, Copilot, AI, Web3, Fintech, English 🏢 Description: 📍 Warsaw (Onsite – near Metro Plac Wilsona) 💼 B2B O Nas Silk Software House to firma deweloperska z siedzibą w Warszawie, dostarczająca wysokiej jakości systemy fintech, e-commerce oraz rozwiązania dla przedsiębiorstw dla klientów długoterminowych. Koncentrujemy się na czystej architekturze, pragmatycznym podejściu do inżynierii oraz tworzeniu oprogramowania, które faktycznie działa w środowisku produkcyjnym przez lata. Twoja rola Szukamy osoby, która przejmie pełną odpowiedzialność za delivery projektów IT i będzie realnie dowozić wyniki — nie tylko raportować status. To rola dla kogoś, kto rozumie produkt i jego kontekst biznesowy, potrafi sprawnie koordynować pracę zespołu oraz współpracę z klientem, a przy tym świadomie wykorzystuje AI, żeby działać szybciej, efektywniej i podejmować lepsze decyzje. Obowiązki Prowadzenie projektów IT end-to-end (discovery → delivery) Planowanie zakresu, harmonogramu i budżetu Zarządzanie zespołem developerskim (BE, FE, AI, integracje) Współpraca z klientami (PL + zagranica) Identyfikacja ryzyk i rozwiązywanie problemów Monitorowanie postępu i jakości delivery Usprawnianie procesów projektowyc używanie ChatGPT / Copilot / automatyzacji optymalizacja komunikacji, dokumentacji i planowania Wymagania Gotowość do pracy w trybie stacjonarnym w naszym biurze w Warszawie (okolice metra Plac Wilsona) 2–4+ lata doświadczenia jako Project Manager w IT Doświadczenie w pracy z zespołami developerskimi Znajomość cyklu wytwarzania oprogramowania Umiejętność prowadzenia kilku projektów jednocześnie Bardzo dobra organizacja pracy i ownership Komunikatywność + praca z klientem Angielski min. B2 Dodatkowym atutem będzie: Doświadczenie lub zainteresowanie obszarami takimi jak Web3, AI lub fintech. Doświadczenie w software house Podejście "delivery>proces" Korzystanie w pracy z AI Nasza oferta: Wynagrodzenie: 10 000 – 20 000 PLN netto (B2B) Współpraca w oparciu o umowę B2B Realny wpływ na kierunek projektów i rozwój firmy Udział w projektach z obszaru AI, Web3 i fintech Dodatkowo: Dobra kawa ☕ Świeże owoce sezonowe i przekąski Integracje zespołowe Sensowna, luźna atmosfera pracy W sezonie wiosenno-letnim – firmowe grille w ramach lunchu oraz po pracy

🏢 Summary: Full Stack Java Developer role focused on enhancing and modernizing legacy Java systems to support ISO 20022, while developing and maintaining backend services in a distributed, event-driven environment. The position involves full lifecycle development, from requirements analysis to production releases, in a hybrid work model in Warsaw. 🗂️ Requirements: 4+ years of experience as Java or Full Stack Developer, Strong experience with Java and Spring ecosystem, Hands-on experience with Hibernate and DB2, Experience with Apache Kafka and event-driven architectures, Experience with MongoDB, Experience building RESTful APIs and microservices, Experience with Maven multi-module builds, Experience with Docker, Experience with Git and CI/CD pipelines, Experience working with distributed systems and legacy codebases 📃 Skills: Java, Spring, SpringBoot, SpringData, SpringSecurity, Hibernate, DB2, Kafka, KafkaStreams, KafkaConnect, MongoDB, REST, Microservices, Maven, Docker, Git, GitLab, CICD, ISO20022 🏢 Description: For our Client we are looking for a Full Stack Java Developer. Warsaw, hybrid (4 days per week from the office) B2B: 28,000–35,000 PLN per month Key Responsibilities Gather and analyse requirements with business stakeholders Design, plan, implement and test changes with the engineering team Adapt and enhance legacy Java applications for ISO 20022 changes Develop and maintain backend services and integrations Participate in code reviews, UAT support and production releases Continuously improve code quality and system design Requirements 4+ years of experience as a Java / Full Stack Developer Strong hands-on experience with: Java, Spring, Spring Boot (DI, Spring Data, Spring Security) Hibernate, DB2 Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) MongoDB (document modelling, Spring Data MongoDB) RESTful APIs, microservices, event‑driven architectures Maven (multi-module builds) Docker Git & CI/CD (GitLab CI preferred) Experience working in distributed systems and complex legacy codebases Strong analytical skills and ability to understand complex business logic Good communication skills and ability to work in a global team