Java Developer (f/m/x)

🏢 Summary: The offer is for a Java Developer responsible for designing and building scalable backend systems and microservices for international clients. The role involves developing Java-based applications, ensuring high code quality, and contributing to technical improvements within a hybrid work model. 🗂️ Requirements: Minimum 5 years of experience with Java, Hands-on experience with Spring Framework, Experience with Hibernate, Understanding of microservice architecture 📃 Skills: Java, Spring, Hibernate, Microservices 🏢 Description: Join Sii and play a key role in delivering solutions for international clients. As a Java Developer, you will design and build scalable backend systems, develop microservices, and ensure high-quality code. You will collaborate with cross-functional teams and support strategic technology initiatives across the organization. We are looking for candidates who are open to working in a hybrid model (2 days at the office). Your tasks Design, develop, and maintain Java-based backend applications Build and evolve microservice architectures Collaborate with product owners, architects, and QA teams Ensure code quality through reviews, testing, and best practices Actively contribute to technical improvements and innovations Requirements At least 5 years of experience with Java Hands-on knowledge of Spring Framework Experience with Hibernate Understanding of microservice architecture Proactive mindset, good communication, and teamwork skills A very good level of English is required Nice-to-have requirements Experience with cloud platforms What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: The offer is for an experienced Java Developer to design, implement and test enterprise-grade applications using modern technologies, microservices architecture and cloud solutions. The role involves developing new functionalities, integrating APIs, ensuring code quality and collaborating within a technical team on global-scale projects. 🗂️ Requirements: Minimum 3 years of commercial experience in Java, Practical experience with Spring Boot and Spring MVC, Experience with Hibernate or JPA, Experience with microservices architecture, Experience with Docker, Kubernetes and Kafka, Knowledge of relational and non-relational databases, Experience in building and integrating REST or GraphQL APIs, Knowledge of SOLID principles, Experience with unit testing using JUnit, Very good English skills 📃 Skills: Java, Spring, SpringBoot, SpringMVC, Hibernate, JPA, Docker, Kubernetes, Kafka, Oracle, PostgreSQL, MongoDB, REST, GraphQL, SOLID, JUnit, AWS, Azure, GCP, Angular, React 🏢 Description: Sii to miejsce, w którym doświadczeni Java Developerzy realizują projekty o globalnym zasięgu, pracując z nowoczesnymi technologiami, architekturą mikroserwisową oraz chmurą. Nasze Centrum Kompetencyjne Digital to ponad 1500 ekspertów, którzy rozwijają rozwiązania enterprise dla branż: finanse, telco,e‑commerce, manufacturing, retail czy healthcare. Jeśli szukasz stabilnego środowiska, projektów o realnym wpływie oraz możliwości ciągłego rozwoju, w Sii znajdziesz miejsce dla siebie. Sprawdź, co możemy Ci zaoferować. Twoje zadania Tworzenie, implementacja oraz testowanie oprogramowania z wykorzystaniem nowoczesnych technologii Dodawanie nowych funkcjonalności Rozwiązywanie problemów związanych z oprogramowaniem (troubleshooting) Przygotowywanie dokumentacji technicznej Zapewnianie jakości kodu oraz przestrzegania standardów programistycznych w projektach Współpraca z pozostałymi członkami zespołu w celu lepszego zrozumienia problemu Proponowanie nowych wariantów optymalizacji i zmian Wymagania Minimum 3 lata komercyjnego doświadczenia w programowaniu w Javie Praktyczna znajomość frameworków Spring (Spring Boot, Spring MVC) oraz Hibernate/JPA Doświadczenie w pracy z architekturą mikroserwisową oraz narzędziami: Docker, Kubernetes, Kafka Znajomość baz danych relacyjnych i nierelacyjnych (np. Oracle, PostgreSQL, MongoDB) Doświadczenie w tworzeniu i integracji web APIs (REST, GraphQL) Umiejętność stosowania dobrych praktyk inżynierskich: SOLID, testy jednostkowe (JUnit), code review, clean code Komunikatywność, otwartość i zaangażowanie w pracę zespołową Bardzo dobra znajomość języka angielskiego w mowie i piśmie Mile widziane Doświadczenie z chmurą: AWS, Azure lub GCP Znajomość technologii frontendowych (np. Angular, React) Benefity, które czekają na Ciebie: Tytuł Great Place to Work od 2015 roku - to dzięki opiniom pracowników otrzymujemy tytuł i wdrażamy nowe pomysły Stabilność zatrudnienia - 2,1 MLD PLN przychodu, brak długów, od 2006 roku na rynku Dzielimy się zyskiem z pracownikami - od 2022 roku przeznaczyliśmy na ten cel już ponad 76 milionów PLN Bogaty pakiet benefitów - prywatna opieka zdrowotna, platforma kafeteryjna, zniżki na samochody i więcej Komfortowe miejsce pracy - pracuj w naszych biurach klasy A lub zdalnie Dziesiątki fascynujących projektów dla prestiżowych marek z całego świata 1 000 000 PLN rocznie na Twoje pomysły - taką kwotą wspieramy pasje i akcje wolontariackie naszych pracowników Stawiamy na Twój rozwój - meetupy, webinary, platforma szkoleniowa i blog technologiczny – Ty wybierasz Fantastyczna atmosfera stworzona przez wszystkich Sii Power People Dołącz do zespołu Sii – rozwijaj umiejętności, zdobywaj doświadczenie i buduj karierę!

🏢 Summary: Full Stack Developer role with a primary focus on backend development in Java, responsible for building and maintaining scalable, secure microservices and REST APIs within an Agile environment. The position involves database design, cloud integration, and CI/CD pipeline participation, with additional work on modern React-based frontend components. The role emphasizes high code quality, performance optimization, and secure application architecture. 🗂️ Requirements: 5+ years experience in Full Stack or Backend development, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Cloud platform experience (AWS, Azure, or GCP), Experience working in Agile teams, Bachelor’s or Master’s degree in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, React, Redux, TypeScript, JavaScript, HTML5, CSS3, MaterialUI, Bootstrap, Tailwind, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is also required. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer. Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.

🏢 Summary: Senior Java Developer role focused on designing and building high-performance, scalable backend systems in a distributed microservices environment for the financial sector. The position involves developing REST APIs, processing large data volumes, and contributing to architecture and CI/CD in cloud-based environments. The role requires strong expertise in Java, Spring, distributed systems, and Kubernetes. 🗂️ Requirements: Minimum 10 years of software development experience, Very good knowledge of Java and Spring, Strong understanding of REST APIs, HTTPS, microservices, and message queues, Ability to design high-availability, scalable, high-performance systems, Very good knowledge of relational databases and SQL, Knowledge of distributed systems and data processing, Hands-on experience with Kubernetes and cloud platforms (GCP preferred), Familiarity with CI/CD pipelines, Experience working in Agile methodologies, Fluent Polish and English, Residence in Poland 📃 Skills: Java, Spring, REST, HTTPS, Microservices, MQ, SQL, Kubernetes, GCP, CI/CD, Agile, DistributedSystems, DataProcessing 🏢 Description: We are looking for an experienced Senior Java Developer to join a team responsible for building and developing modern backend systems in a distributed environment. The projects involve high-performance and scalable solutions used in the financial sector, with a focus on processing large volumes of data and microservices architecture. Your tasks Designing and developing backend systems based on Java Creating and evolving a microservices architecture Building and maintaining REST APIs and system integrations Designing solutions that meet high availability and performance requirements Working with systems that process large volumes of data Collaborating with the team using Agile methodologies Participating in architecture design and technical decision-making Implementing and optimizing CI/CD processes and ensuring system security Requirements Minimum 10 years in software development Very good knowledge of Java (backend) and Spring Strong understanding of REST APIs, HTTPS, microservices, and message queues (MQ) Ability to design high-availability, scalable, and high-performance systems Very good knowledge of relational databases (SQL) Familiarity with CI/CD pipelines and Agile ways of working Knowledge of distributed systems and data processing Hands-on work with Kubernetes and cloud platforms (GCP preferred) Fluent Polish and English required Residing in Poland required Nice-to-have requirements Knowledge of Go, Rust, or similar system-level languages Experience with NoSQL and analytical databases, e.g., ClickHouse Frontend development experience Familiarity with the banking sector (trade lifecycle, FX, post-trade processing) Banking experience / FX experience (forex) Working from the office in Krakow 6 times per month What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: The offer is for a Java Developer responsible for analyzing requirements, designing and implementing new functionalities, and maintaining existing systems in the insurance domain. The role involves end-to-end participation in software development, including testing, documentation, and code quality assurance within a collaborative team environment. 🗂️ Requirements: Practical knowledge of Java, Basic knowledge of JEE, Basic knowledge of relational databases, Basic knowledge of SQL (Oracle), Knowledge of object-oriented analysis, Basic knowledge of Linux 📃 Skills: Java, JEE, SQL, Oracle, Linux, OOP 🏢 Description: Main responsibilities: Analysis of client requirements Designing new solutions and functionalities Implementation of new solutions Maintenance of existing features Ensuring the quality of developed and maintained code Testing developed solutions Documenting implemented solutions Sharing knowledge across the team and participating in code reviews Continuous collaboration with other team members Our requirements: Practical knowledge of the Java programming language Basic knowledge of JEE Basic knowledge of relational databases and SQL (Oracle) Knowledge of object-oriented analysis Basic knowledge of the Linux operating system English language skills required for communication and working with technical documentation Good communication and collaboration skills Fluent Polish language skills Nice to have: Proven experience with Spring Boot, RESTful API design and JWT authentication Proven experience with Angular frontend Advanced knowledge of Linux operating system German language skills We offer: Opportunity to work on various phases of software projects, including analysis, design, implementation, integration, testing, and troubleshooting Work with a friendly and supportive development team Flexible working hours Stable employment German language course Private medical care with the option to extend coverage to family members Group insurance Holiday subsidy No dress code About us: We maintain and develop existing and new management systems and IT systems for insurance companies.

🏢 Summary: B2B contract role for a Senior Java Developer focused on designing and maintaining scalable backend systems and APIs across diverse software projects, including AI-driven and legacy modernization initiatives. The position involves architectural input, code quality improvements, and deployment support in cloud environments within Agile teams. 🗂️ Requirements: Minimum 5 years of experience as a Java Developer, Commercial experience with Spring Boot or Hibernate, Strong knowledge of object-oriented programming and design patterns, Experience building and integrating RESTful APIs, Experience with SQL and NoSQL databases, Experience with cloud platforms (AWS, Azure, or GCP), Knowledge of CI/CD pipelines and version control systems, Experience working in Agile/Scrum teams, English proficiency at B2 level or higher, Experience with AI technologies or AI-powered solutions 📃 Skills: Java, Spring, SpringBoot, Hibernate, REST, SQL, NoSQL, PostgreSQL, MySQL, MongoDB, AWS, Azure, GCP, CI/CD, Git, OOP, Scrum, AI 🏢 Description: About position: We are currently building our talent pool for future Senior Java Developer roles. As our company is expanding, you may have the opportunity to work on a variety of software solutions across multiple initiatives, including projects we will be delivering in the future, from building native AI solutions to modernizing legacy systems. If you enjoy collaborating in a skilled team and are committed to delivering top-notch software, we’d love to connect. We're not prescriptive about background. Whether you've worked in fintech, SaaS, e-commerce, or enterprise systems, what matters is that you've shipped production software at scale, cared about its reliability, and learned from what broke. Who we are: We are Inspeerity (part of DevelopX group), engineering consultancy providing software development and consultancy. Our primary expertise is systems architecture and full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people. TL;DR • Who : Senior Java Developer • Contract Type : B2B Framework Agreement. • Salary range: Up to 150 PLN/h • Company : Software House What you’ll be doing: Designing, implementing, and maintaining high-quality Java applications. Developing backend components and APIs to support scalable software solutions. Collaborating with cross-functional teams. Reviewing and refactoring code to ensure maintainability, performance, and security. Participating in technical design discussions and contributing to architecture decisions. Writing and maintaining technical documentation for systems, APIs, and processes. Supporting deployment and integration of applications in different environments. You will be the best fit if you have: 5 years of experience as a Java developer, preferably with exposure to Spring Boot, Hibernate, or similar frameworks. Strong understanding of object-oriented programming, design patterns, and clean code principles. Experience with RESTful APIs and web services integration. Familiarity with SQL and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB). Experience with cloud environments such as AWS, Azure, or GCP. Knowledge of CI/CD pipelines and version control systems (e.g., Git). Strong problem-solving skills and ability to troubleshoot complex issues. English level B2 or higher. Experience working in Agile/Scrum teams and contributing to iterative development. Experience with AI technologies, including using AI tools for development and building AI-powered features or applications. What we offer : Remote work or working from our Bialystok, Warsaw, Rzeszow offices. It's up to you! Collaboration with experienced and engaged people who will appreciate your work and support you whenever you need it 😊 Hybrid and flexible cooperation model based on a B2B Framework Agreement. Great working conditions and best equipment: Dell or MacBook, your choose. Good to know: We don’t require a degree. We don’t do whiteboard puzzles or trick questions. Our interview process is practical: a technical conversation and a chat about how you work. We value direct communication and intellectual curiosity. If you’re someone who gets excited about debugging a tricky concurrency issue - not because you have to, but because you want to understand it — we’ll get along well.

🏢 Summary: Backend-focused Full Stack Developer role centered on designing and building scalable, secure Java-based applications within an Agile environment. The position emphasizes backend development with Spring Boot and microservices, while contributing to CI/CD, cloud deployments, and optionally modern React-based frontend components. You will develop high-performing systems, integrate APIs, and ensure code quality through testing and best practices. 🗂️ Requirements: 5+ years experience as Java Backend or Full Stack Developer, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Experience with AWS, Azure or GCP, Bachelor’s or Master’s degree in Computer Science or related field, Experience working in Agile teams 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP, React, Redux, TypeScript, HTML5, CSS3 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for a Backend-Focused Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is a valuable plus. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer (Java-focused). Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.

🏢 Summary: The offer is for a Java Software Developer to build and maintain modern microservices applications within a multidisciplinary agile team. The role involves designing solutions, participating in sprint planning, performing code reviews, and working with cloud-based and containerized environments. It requires close collaboration with business stakeholders and focuses on delivering high-quality, scalable systems. 🗂️ Requirements: Completed university degree in Computer Science or related field, Minimum 3 years of professional experience in software development, Strong experience in Java and Spring ecosystem, Solid understanding of microservices architecture, Hands-on experience with Kafka, MongoDB, Oracle and AWS, Experience with Docker and container orchestration platforms, Practical experience with Agile methodologies, Experience with TDD and writing clean, testable code, Very good English and Polish language skills 📃 Skills: Java, Spring, SpringBoot, SpringDataJPA, Microservices, Kafka, MongoDB, Oracle, AWS, Docker, Kubernetes, OpenShift, Scrum, Kanban, XP, TDD 🏢 Description: Responsibilities You will join a vast multidisciplinary agile team of experts and develop modern microservices applications You will take care of the relationship with the business customers in order to understand their needs and expectations Together with your agile team, you will define the next sprint, provide estimates and create solution proposals for complicated tasks Code reviews are standards here and you will help colleagues by giving them advice and providing insightful hints for their growth Qualifications Completed university degree in Computer Science or a related field 3+ years of professional experience in software development Strong experience in Java and Spring ecosystem (Spring, Spring Boot, Spring Data JPA) and solid understanding of microservices architecture Hands-on experience with Kafka, MongoDB, Oracle and AWS cloud , including deployment and maintenance of cloud-based applications Knowledge of Docker and container orchestration platforms such as Kubernetes or OpenShift Practical experience with Agile methodologies (Scrum, Kanban, XP), TDD and writing clean, maintainable and testable code Experience in Banking, Finance or Payments domains will be a strong plus. Very good communication skills in English and Polish and availability to work in a remote or hybrid model (office visit once per month) About Nexi Digital Nexi Digital is a Joint Venture between Reply and Nexi Group. It delivers cutting-edge digital solutions for the Nexi Group, the European PayTech leader. Nexi Digital works with modern technologies, uses agile processes and methodologies, and operates in a collaborative way with the Nexi Group to contribute to the success of all businesses. Our mission is to support the Nexi Group, to build and operate high-quality, distinctive, and timely digital solutions which enable us to deliver value to Nexi’s customers across Europe.

🏢 Summary: Remote Senior Java Developer role focused on modernising legacy Java systems in a fintech environment using AI-assisted analysis, refactoring, and testing. The position involves building AI-powered CI/CD pipelines, developing MCP servers and LLM-based engineering tools, and improving API performance and reliability. The role targets measurable system improvements in high-reliability financial systems. 🗂️ Requirements: 6+ years Java backend experience, Strong Spring Boot expertise, Experience modernising legacy systems at scale, Background in fintech, banking or trading systems, Strong multithreading and concurrency knowledge, Experience with AI-assisted development tools, Strong API design knowledge, Experience with microservices architecture 📃 Skills: Java, Spring, SpringBoot, Multithreading, Concurrency, Locking, Atomics, Microservices, APIs, CICD, GitHub, Copilot, Claude, LLM, MCP, Testing, Refactoring, Security, Fintech, Banking 🏢 Description: Senior Java Developer | Remote| Fintech Client You will: Modernise legacy Java services using AI-assisted analysis, refactoring and testing Build AI-powered CI/CD pipelines with automated code review, test generation and security scanning Develop MCP servers and LLM-based tooling for other engineering teams Ship measurable results: faster APIs, better performance, higher reliability You bring: 6+ years of Java backend experience with strong Spring Boot expertise Hands-on experience modernising legacy systems at scale Background in banking, fintech, trading or similar high-reliability domain Solid multithreading knowledge in production systems (concurrency, locking, atomics) Practical use of AI dev tools – Claude Code, GitHub Copilot or similar Strong API design and microservices architecture knowledge English B2+

🏢 Summary: Offer for a Mid Java Developer to build and maintain scalable backend systems using Java and Spring Boot in a full-time onsite role. The position involves developing REST APIs and microservices, working with relational databases, and collaborating with cross-functional teams. The role focuses on clean, production-ready code and gradual ownership of system components. 🗂️ Requirements: 3–5 years commercial experience as Java Developer, Strong Java 11+ knowledge, Practical Spring Boot experience, Solid Hibernate ORM knowledge, Experience with SQL and relational databases, Experience with Git, Experience with Gradle or Maven, Experience with CI/CD pipelines, Ability to use AI development tools, English B2 or higher, Full-time onsite availability in Warsaw 📃 Skills: Java, Spring, SpringBoot, Hibernate, SQL, PostgreSQL, MySQL, Git, Gradle, Maven, CI/CD, REST, Microservices, DDD, Kafka, AWS, GCP, Azure, Docker, Kubernetes 🏢 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 actually runs in production for years. Your Role As a Mid Java Developer, you’ll work on real-world backend systems used by thousands of users. You’ll develop and maintain scalable services, collaborate closely with senior engineers, and gradually take ownership of system components. Responsibilities -Develop and maintain backend services in Java (11+) using Spring Boot -Implement and evolve REST APIs and microservices -Work with relational databases ( PostgreSQL, MySQL ) and Hibernate -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 as a Java Developer Practical experience with Java and Spring Boot Solid understanding of Hibernate ORM and SQL databases Familiarity with Git, Gradle/Maven, CI/CD pipelines Ability to use modern AI dev tools effectively ( ChatGPT, Claude, Cursor, etc. ) English at B2 level or higher Nice to Have Kafka or event-driven systems Basic cloud experience (AWS, GCP, Azure) Docker, Kubernetes basics Rates (B2B) 90–120 PLN / hour Recruitment Process Intro call (30 min) Technical interview or short task Final fit & project discussion Offer Tech Stack Java: Regular Spring Boot: Regular Hibernate: Regular PostgreSQL: Regular Solid: Regular DDD: Regular REST API: Regular