Java/J2EE Developer – Backend Integration

Our client, a public sector organization, is looking for a backend specialist to join the core team of a centralized citizen portal. The project focuses on aggregating citizen data from various sources to provide a secure and optimized user experience across web and mobile platforms.

• Design, implement, and maintain scalable backend services using Java and Spring Boot.
• Ensure technical integrity, security, and performance of aggregated citizen data.
• Apply best practices including TDD, Domain-Driven Design (DDD), and microservices architecture.
• Develop and optimize REST APIs to facilitate data delivery to web and mobile applications.
• Collaborate with architects to align technical components with the overarching system architecture.
• Lead development cycles, including coding, testing, and debugging to ensure robust releases.
• Automate deployments and monitoring through CI/CD pipelines and DevOps principles.

• 5+ years backend development with Java, J2EE, and Spring Boot.
• 5+ years with Spring Data, Spring Security, and Maven.
• 3+ years experience with microservices architecture.
• 3+ years experience with Hibernate, JPA, or SQL.
• 1+ years experience with DevOps tools and CI/CD pipelines.
• You have experience leading a development team and coaching other developers.
• You possess a strong background in Agile development methodologies.
• You're proactive, analytical, and a communicative team player.
• You are fluent in Dutch with C2 level.

Nice to Haves

• 3+ years experience with Docker, OAuth2, and SOAP.
• 1+ years experience with AWS.
• Knowledge of Node.js and mobile application development.
• Experience with testing tools such as JMeter, JUnit, AssertJ, Postman, or Newman.

• Start date: 18/05/2026
• Duration: until 15/07/2027
• Work regime: Full-time
• Location: Brussels
• Working model: Hybrid (min 2 days onsite in Brussels including fixed Wednesdays, occasionally in Ghent)
• Contract: Always include "open to both permanent employees and freelancers"