Senior Java Software Engineer

Role: Senior Java Software Engineer

Location: Brussels, Belgium

Contract: 12 months

Rate: Flexible

We are looking for a Senior Java Software Engineer to join a high-performing technology team responsible for building and modernising mission-critical financial systems in a regulated environment.

The role focuses on the design and development of cloud-ready, event-driven Java services , operating at scale and integrating with both modern platforms and legacy backend systems.

You will work as part of an Agile delivery team , collaborating closely with architects, technical leads, and other engineers to deliver robust, secure, and performant solutions.

Key Responsibilities

• Design, develop, and maintain Java-based microservices using modern frameworks
• Contribute to event-driven and service-oriented architectures
• Ensure solutions meet functional and non-functional requirements (performance, resilience, security)
• Align implementations with enterprise architecture and engineering standards
• Participate in solution design walkthroughs and peer reviews
• Undertake hands-on development while mentoring more junior engineers
• Support delivery across the full SDLC, including testing, deployment, and post-production support

Required Technical Skills

• Strong core Java development experience
• Hands-on experience with Spring Boot and microservices
• Experience building containerised applications using Docker and Kubernetes / OpenShift
• Practical experience with event streaming platforms (e.g. Kafka)
• Experience developing and deploying on Linux / Unix environments
• Solid understanding of object-oriented design and clean code principles
• Experience with test-driven and behaviour-driven development
• Exposure to performance profiling and tuning

Nice to Have

• Experience in regulated or financial services environments
• Knowledge of messaging standards (e.g. JSON)
• Familiarity with DevOps practices and tooling
• Exposure to legacy systems or mainframe integration