We are supporting a consultancy delivering large-scale digital and application modernisation programmes within a highly regulated public sector environment in Brussels. For a long-term engagement, we are looking for a Medior Java Full-Stack Developer to join a client team focused on evolving critical platforms and ways of working.

This role combines hands-on development with the opportunity to influence how solutions are designed and delivered – challenging legacy approaches and helping teams adopt more modern engineering practices.

Logistics

Role: Freelance Medior Java Full-Stack Developer
Contract: Long-term (12+ months)
Location: Belgium (Hybrid)
Languages: English + French or Dutch
Start Date: ASAP / Flexible
Rate: Strongly competitive

Responsibilities

Design and develop applications using Java and Spring Boot
Work across the full stack, including Angular-based frontends
Contribute to new builds and the evolution of existing systems
Challenge existing technical approaches and suggest improvements
Support and guide a small team of developers
Collaborate with stakeholders to deliver practical, scalable solutions
Ensure quality through testing, CI/CD, and best practices

Required Skills

Strong experience with Java (Spring Boot) in a medior/senior capacity
Full-stack experience including Angular
Experience with microservices and REST APIs
Working knowledge of Kubernetes environments
Familiarity with CI/CD and DevOps practices
Strong communication skills and ability to influence decisions
Experience in structured environments (public sector preferred)

Nice to Have

Experience within regulated or enterprise environments
Exposure to private cloud environments
Experience with testing frameworks
Previous mentoring or leadership experience

If you’re a medior Java developer looking for a long-term engagement where you can influence both technical direction and team practices, we’d be happy to discuss further.

Apollo Solutions

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