Application Developer (Java Full Stack) Job ID: JP054782

About the job Application Developer (Java Full Stack) Job ID: JP054782 Application Developer (Java Full Stack) We are looking for an experienced Application Developer to support the takeover, maintenance, modernization, and development of a portfolio of business-critical applications within a large enterprise environment. You will work on both maintaining existing systems and re-engineering applications to align with modern development standards. Key Responsibilities Develop, maintain, and enhance business applications and web services. Participate in the takeover and knowledge transfer of existing applications. Re-engineer and modernize legacy applications using current technologies and best practices. Design and develop application components in collaboration with technical leads and software architects. Build RESTful APIs and full-stack web applications. Participate in Agile/Scrum ceremonies, technical workshops, and user meetings. Perform unit testing, technical documentation, deployment, and reporting using Jira and related tools. Troubleshoot, maintain, and improve existing codebases in complex multi-system environments. Required Skills & Experience Minimum 7 years of professional Java development experience (full-stack preferred). Strong experience with: Java 17+ Spring Framework 4+ Spring Boot 3+ Angular 19+ RESTful APIs & OpenAPI Maven Docker Git NPM PostgreSQL, SQL Server, and relational databases JUnit, Mockito, Cypress (Test-Driven Development) BPMN and UML Experience working with Agile/Scrum methodologies and CI/CD practices. Strong analytical and problem-solving skills with the ability to understand and maintain existing applications. Nice to Have Keycloak Hibernate Lombok MapStruct OpenShift / Kubernetes GitLab CI SonarQube OAuth 2.0 Flyway or Liquibase Jira & Confluence Languages Fluent Dutch or French (one is required). Advanced written English. Work Arrangement Hybrid role with a minimum of 2 days onsite per week in Brussels. Initial contract until 30 September 2026, with strong possibility of extension. EU nationals only.