We are supporting a specialist consultancy delivering high-impact digital transformation initiatives within the Belgian federal public sector. For a long-term engagement, we are looking for a Senior Java Full-Stack Developer to join a client-facing team driving application modernisation and agile ways of working.
Please double check you have the right level of experience and qualifications by reading the full overview of this opportunity below.
This role goes beyond development, you will play a key part in challenging legacy approaches, introducing modern engineering practices, and helping teams evolve both technically and culturally.
Logistics
Role: Freelance Senior Java Full-Stack Developer
Contract: Long-term (12+ months)
Languages: French or Dutch & English (French-speaking team environment)
Start Date: Start of May
Responsibilities
Design, develop, and maintain modern applications using Java and Spring Boot
Contribute to both new builds and the evolution of existing platforms
Work across the full stack, including Angular-based frontends
Lead or mentor a small team of developers (3-4 people)
Challenge existing technical approaches and propose improved solutions
Drive adoption of agile, DevOps, and value-focused development practices
Collaborate closely with business stakeholders and cross-functional teams
Ensure high code quality through testing, CI/CD, and best practices
Required Skills
Strong experience as a Senior Java Developer (Java 17, Spring Boot, JPA)
Experience with microservices and REST-based architectures
Hands-on experience working with Kubernetes (usage, not setup)
Solid understanding of CI/CD pipelines (e.g. GitLab)
Experience with DevOps / DevSecOps principles
Familiarity with SQL databases and messaging systems (e.g. ActiveMQ)
Experience working in Agile/Scrum environments xphnsxz
Strong communication skills and ability to influence technical direction
Experience within the Belgian public sector (federal level strongly preferred)
Nice to Have
Experience with testing frameworks (Cucumber, Karate, Pact)
Exposure to private cloud environments
Experience modernising legacy systems
Previous team leadership or coaching experience
If you’re a senior Java developer who enjoys challenging the status quo, influencing teams, and delivering impactful solutions within complex environments, we’d be happy to discuss further.
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