B2B | Java Developer | Hybrid Brussels

We're Hiring | Senior Fullstack Java Developer (Java 6 / JavaFX / Swing) | Brussels

Be one of the first applicants, read the complete overview of the role below, then send your application for consideration.

We are hiring for an international client operating in the Railway Infrastructure & Transportation sector, supporting mission-critical applications used for transport planning and operational management.

Location: Brussels, Belgium (Hybrid - 2 days onsite/week)

Start Date: ASAP

Contract Type: B2B / Independent Freelancer

Duration: Long-term assignment

Languages: Dutch or French + very good English

What You'll Do

• Analyze business requirements and translate them into technical solutions
• Develop, maintain, and optimize complex Java applications
• Work with legacy technologies including Java 6, JavaFX, and Swing
• Contribute to test automation and CI/CD initiatives
• Ensure code quality through Clean Code and SOLID principles
• Collaborate in a Scrum/LeSS environment
• Coach and mentor junior developers
• Participate in an on-call rotation after training

Mandatory Skills

• Minimum 5 years of professional experience in Java development
• Strong Java development experience
• Java 6
• JavaFX
• Swing
• Fullstack development experience
• Agile/Scrum methodology
• Fluent Dutch or French and strong English communication skills

Nice to Have

• CI/CD experience
• Test automation
• Clean Code & SOLID principles
• Experience in large-scale enterprise environments
• Mentoring/coaching experience

This opportunity is ideal for developers who enjoy working on complex enterprise systems and have hands-on experience with legacy Java technologies that remain essential to business-critical operations.

Interested? xlxgzvr Apply directly via LinkedIn or send your updated CV to

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Remote working/work at home options are available for this role.