Senior Java Consultant, Brussels

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)

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

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.

#J-18808-Ljbffr