We are looking for a mid-level Java Developer to join our team. You will work on a modern backend built in Java and Spring Boot, expose RESTful APIs consumed by the frontend, and integrate with multiple external systems. This is a hands-on role where you will take part in building new features, improving system architecture, and ensuring code quality. We will only consider people living in Warsaw and the immediate surrounding area, ready for hybrid work with 2-3 office visits per week. Your tasks Develop, maintain, and optimize backend services built with Java and Spring Boot Design and implement REST APIs used by the frontend and external partners Integrate with external APIs and ensure reliable data exchange Write clean, testable, and maintainable code (unit & integration tests with Spock/JUnit) Work with PostgreSQL and use Flyway for database migrations Participate in code reviews and contribute to continuous improvement Collaborate with cross-functional teams in an Agile environment Use Git for version control and GitHub Actions for CI processes Requirements Minimum 4 years of commercial experience in Java development Strong knowledge of Spring Boot and building REST-based applications Proficiency with SQL and relational databases (PostgreSQL) Experience with unit and integration testing (Spock/JUnit) Solid experience working with Git Practical understanding of API integrations Strong analytical and problem-solving abilities Practical experience with Azure Cloud Good command of both English and Polish (written and spoken) Residing in Poland required Willingness to work hybrid with 2-3 visits to the office in Warsaw per week Nice-to-have requirements Familiarity with Docker or containerization practices Knowledge of CI/CD pipelines (e.g., GitHub Actions) Understanding of software architecture and design patterns Previous use of Flyway for schema versioning