RELYzITFull-stack Developer Java / Angular (Freelance) – Brussels, Belgium
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We’re seeking a Full-stack Developer Java / Angular (Freelance) to join our client’s mission-critical Defence program in Brussels. This is a unique opportunity to take ownership of a diverse application landscape, driving the re-engineering and modernization of essential business systems. You’ll be at the heart of a long-term transformation, ensuring operational excellence and future-proofing technology for a vital sector.
Our client is embarking on a complete takeover and modernization of approximately thirty business applications for a major Defence program. Your expertise will directly impact the reliability, security, and evolution of these systems, supporting national infrastructure and enabling innovation. This is a high-stakes environment where your contributions will shape the digital backbone of a critical organization.
Lead the development and maintenance of business applications, ensuring seamless handover and operational continuity.
Design and implement application components and RESTful web services using Java 17+, Spring Boot 3+, and Angular 19+.
Collaborate closely with technical leads and senior architects to re-engineer or rewrite applications, aligning with modern development standards.
Participate in technical working groups, Scrum ceremonies, and user meetings to drive project outcomes.
Contribute to testing, technical documentation, deployment, evaluation, and reporting (including Unit testing and JIRA tracking).
Integrate into existing teams, quickly understanding and improving complex, multi-system environments.
Spring 4+, Spring Boot 3+ (Confirmed)
RESTful Web Services, OpenAPI (Confirmed/Junior)
Test-driven development: JUnit, Mockito, Cypress
Relational databases & O/R mapping: PostgreSQL, SQL Server
Ability to read and understand BPMN, UML, and documentation practices
Familiarity with Agile/Scrum methodologies, continuous integration
Keycloak, Hibernate, Lombok, Mapstruct
Openshift/Kubernetes, GitLab CI, Sonar
OAuth 2.0, Flyway or Liquibase
French or Dutch: Expert level (spoken and written)
Minimum 7 years of full-time professional Java development experience (full-stack preferred, with a passion for frontend)
Experience in multi-system integration and complex environments
Solution and customer-oriented mindset
Problem solver, able to quickly understand and improve existing code
Ability to integrate easily into established teams
Partial remote work: On-site presence required at least 2 days per week in Brussels
Freelance contract until 30/09/2026, with potential for extension
Standard working hours: 7h48 per day
Ready to Build the Future?
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