? Brussels region | ? Flexible hybrid working
? Start date: January 2027
? Duration: 220+ man-days
? Languages: Dutch or French + English
For a leading organization within the Belgian infrastructure sector, we are looking for a Freelance Senior Full Stack Developer with strong expertise in Java, Angular and LeSS. You will join a business-critical IT environment where applications play a key role in operational processes and daily services.
As a Senior Full Stack Developer, you will collaborate with multiple Scrum teams and contribute to the development, improvement and quality of scalable software solutions.
Your responsibilities:
? Perform technical analyses and translate functional requirements into sustainable solutions
? Develop and maintain high-performance Java solutions
? Build high-quality software following clean code principles and security best practices
? Implement and maintain automated testing within CI/CD pipelines
? Analyze and resolve technical issues, perform bug fixing and optimize existing applications
? Support deployments and software releases in an on-premise environment
? Share knowledge and coach fellow developers
? Support Agile ways of working and LeSS adoption within teams
Your profile:
? 15+ years of experience in Java development (Java 21)
? Strong experience with Spring Framework, Hibernate/JPA and SQL
? Minimum 10 years of experience with Scrum
? Experience with LeSS implementation and Agile scaling
? Experience with TDD, unit testing (JUnit, Mockito) and CI/CD
? Knowledge of Microservices, Domain-Driven Design (DDD) and Hexagonal Architecture
? Experience with Angular (version 19 or higher)
? Knowledge of Kafka, Hazelcast and WebSocket is a plus
? Experience with DevOps principles
? Fluent in Dutch or French and English
Soft skills:
? Analytical and solution-oriented mindset
? Takes initiative and works independently
? Strong communication skills
? Team player with a coaching mindset
? Flexible and responsible approach
After an onboarding period, you are willing to participate in a 24/7 on-call rotation.
