Urgent - we are hiring senior Java profile / Solution Architect - experienced developer Happening is urgently looking for a Java expert to join one of our clients on strategic, high-impact projects. Your mission Design, analyze, and develop Java / J2EE solutions aligned with functional and technical requirements Define and implement scalable, secure, and high-performing architectures (MicroServices, API-first, cloud) Ensure code quality through best practices (TDD, CI/CD, DevSecOps, code review) Collaborate with cross-functional teams in an Agile / Scrum environment Coach and mentor developers when needed Contribute to both new application development and the maintenance/evolution of existing systems Technical stack (non-exhaustive) Languages / Frameworks: Java, JEE, Spring, Spring Boot, Hibernate / JPA, Node.Js (TypeScript), GWT API & Integration: REST, SOAP, JSON, XML, API design, Kafka, event-driven architecture Frontend: Angular, HTML, CSS, JavaScript Databases: PostgreSQL, Oracle, PostGIS, RDBMS, NoSQL, key-value stores Testing & Quality: JUnit, Assertj, Test Driven Development Tools & Methodologies: Maven, GIT, Jira, Confluence, Miro Cloud & DevOps: AWS, Azure, CI/CD pipelines, DevSecOps Security: solid knowledge of security standards and best practices Profile we are looking for 5-9+ years of proven experience in Java development and/or architecture Strong expertise in Spring/Spring Boot, Hibernate, JPA Proven experience in API design, integration, and distributed environments Solid knowledge of cloud architectures (AWS/Azure) and/or hybrid solutions Experience in Agile / Scrum, ideally with a lead developer or Solution Architect role Strong analytical mindset, autonomy, and excellent communication skills Previous experience in public sector projects is a strong plus Location & setup: Hybrid mission: minimum 2 days per week on-site in Belgium If you are a seasoned Java expert with strong experience in development, architecture, and modern best practices, and want to join a challenging project with a rich technology stack: apply now!