Senior Java Developer

Senior Java Developer – Freelance & Employees
Are you a passionate
Senior Java Developer
ready to dive into complex systems, microservices, and modern architectures?

Join a
dynamic international tech team
working on cutting-edge digital payment and card solutions – where innovation meets impact.

About The Project
You'll join an
agile product team (7 developers)
working on a major platform built around a
central Java 8 application
and a growing ecosystem of
microservices
.

Your mission: help evolve this core system, build new features, integrate with new group-wide products, and shape the future of the platform.

This is a
key technical role
where you'll touch both
development
and
infrastructure
, collaborating closely with architects, DevOps, and product experts.

Your Responsibilities

• Design, develop, and maintain robust backend services and APIs.
• Contribute to both new features and modernization of legacy components.
• Integrate complex systems across the group's technology landscape.
• Troubleshoot, resolve incidents, and continuously improve system reliability.
• Collaborate within a cross-functional Scrum team and share best practices.
• Be proactive – propose ideas, challenge solutions, and drive innovation.

Your Tech Stack
We're Looking For Someone Comfortable With

• Java 8+ and modern Java versions/frameworks (Spring, Spring Boot)
• Maven, Hibernate, SQL
• GitLab and Azure DevOps (branching, CI/CD, code reviews)
• Microservices architecture, ideally with CQRS and AKS (Azure Kubernetes Services)
• Kotlin experience is a strong plus

You'll Fit Right In If You…

• Adapt quickly and love solving complex technical puzzles
• Communicate clearly and collaborate across teams
• Thrive in fast-moving environments with evolving priorities
• Are proactive, curious, and eager to make an impact
• Enjoy being a driver of change, not just an executor

Practical Info

• Location: Brussels (near a Station)
• Remote: 2 days onsite per week (flexible)
• Start Date: ASAP
• Contract: Freelance or Temp-to-Perm
• Language: French (team), English (mandatory)
• Duration: Renewable yearly

• Interview Process:

• 1 Interview + short technical assessment

• Fast feedback & decision

Why Join?
Cutting-edge Java + microservices environment

Collaborative, agile, and innovative culture

Hybrid working model with flexibility

Long-term project with evolution potential

Be part of a technically challenging, high-impact ecosystem

Apply Now