JOB TITLE: SENIOR JAVA DEVELOPERLANGUAGES REQUIRED: ENGLISHWORK LOCATION: BRUSSELS, BELGIUMWORK MODE: HYBRID (2 DAYS/WEEK ONSITE)CONTRACT DURATION: 29/06/2026 - 31/12/2026JOB DESCRIPTIONWe are seeking a Senior Java Developer to lead the design, development, and maintenance of backend components and RESTful APIs supporting enterprise-grade applications.The ideal candidate combines deep technical expertise with strong collaboration skills, ensuring robust, scalable, and maintainable solutions.Key ResponsibilitiesDesign, develop, and maintain backend services and REST APIs using Java and Spring Boot.Ensure code quality through unit, integration, and performance testing.Conduct code reviews, promote best practices, and mentor junior developers.Collaborate with architects, analysts, and DevOps engineers to define and refine technical solutions.Support deployment, cutover, and hypercare phases, ensuring stable releases.Troubleshoot and resolve production issues, ensuring system performance and reliability.Maintain and update technical documentation for services, configurations, and interfaces.Contribute to technical design discussions, ensuring alignment with architectural principles and cloud strategy.Conformity CriteriaA minimum of 10 years working experience as a Java developerDemonstrable experience -minimum 5 years with microservices architectureDemonstrable working experience with integration with SAAS solutionsDemonstrable experience -minimum 5 years with Spring frameworkMinimum 2 days per week onsiteC1 level (or equivalent) proficiency in spoken and written EnglishEvaluation criteriaCore Java Proficiency: Uses OOP, collections, streams, and exception handling effectivelyFrameworks & Libraries: Applies Spring Boot, JPA/Hibernate, Maven/Gradle, testing frameworksAPI Design & Integration: Designs clean, reusable REST APIs, respects standards and security