Senior Java Consultant

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.

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)
• Location: Belgium (Hybrid)
• Languages: French or Dutch & English (French-speaking team environment)
• Start Date: Start of May
• Rate: €(Negotiable & Competitive)

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)
• Proven full-stack development experience (Angular, TypeScript)
• 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
• 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.