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Join us as a Backend Developer specializing in Java and Spring Boot, where you will play a pivotal role in building and enhancing a modern debt-management and debt-registering platform used by Norwegian social welfare offices and institutional partners. Your day-to-day responsibilities will include developing backend microservices using Java 21, Spring Boot 3.X, WebFlux, and Project Reactor, ensuring the system is high-performing and reactive to process large volumes of sensitive documents efficiently. You will write clean, maintainable, and scalable code, backed by comprehensive unit and integration testing, while collaborating closely with both KOIA engineers and our Norwegian fintech client. You will work onsite or hybrid from the Tricity area, participating in core CET business hours and occasionally traveling to Norway or our Polish office for in-person meetings. You might be the perfect match if you are/have: ~3+ years of experience as a Backend Java Developer ~ Strong proficiency in Java 17+ (we use Java 21)~Understanding and practical exposure to reactive programming with Spring WebFlux and Project Reactor (Mono/Flux), ~ Experience working with SQL databases (MariaDB/MySQL/PostgreSQL), R2DBC (reactive database connectivity), schema design, and performance optimization ~ Familiarity with Gradle and Git workflows and Monorepo/multi-module project management Ability to write clean, maintainable code, including unit and integration tests (JUnit 5, TestContainers, WireMock) Nice to have (not required, but a strong plus): AWS (S3, RDS, Lambda), Maintaining Node.Js/TypeScript legacy services. js/Prism Backend: Java 21, Spring Boot 3.X, WebFlux, Project Reactor, R2DBC Databases: Infrastructure: AWS (S3, RDS, Lambda), Docker, Kubernetes (EKS) Testing: Legacy components: Node.Js/Express, TypeScript Project Management: Jira Develop backend microservices using Java 21, Spring Boot 3.Ensure high code quality by writing unit and integration tests Collaborate closely with KOIA engineers and the client’s technical team Participate in a hybrid workflow with onsite collaboration when needed Occasionally travel to Norway or our Polish office for in-person meetings Pay attention to detail and ensure the quality of development work. KOIA is not just a software development house. We are a crew creating amazing solutions that serve businesses. We are learning from each other and working not only on interesting but also on revolutionizing (even life-changing) sustainable projects every day. Thats what has made our past and current projects successful and incredibly rewarding. 22-28 EURO/H + VAT (B2B contract, rate based on programming proficiency) Dynamic Work Environment : an invigorating workspace with a mix of Norwegian and Polish innovation focused on smart software solutions. Continuous Learning : We support continued learning and offer learning opportunities as well as access to any tools you might need It is not only about work. Excellent Office Space: Although we are remote-first, our office offers a comfortable and adjustable workspace with plants, bike parking, and a loaded kitchen. Fantastic Partners: Youll have the chance to work with innovators in the fintech and climate-tech scenes in the Scandinavian region. By joining KOIA, you will join a successful team committed to creating meaningful solutions and promoting a healthy and fulfilling work environment. Video Call with HR A 1 hour conversation with our HR team to discuss your background, expectations, and company culture fit. Pair Programming Video Call A hands-on coding session with one of our engineers and/or our CTO, where you’ll collaborate on a real-world problem to assess your technical and problem-solving skills. Due to the Christmas break, all technical interviews will be scheduled from January onward.