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Senior React Developer (Freelance) – Brussels

About the Opportunity

We are looking for an experienced Senior React Developer to join an established development team working on a large-scale enterprise application. This is a long-term freelance opportunity for professionals who enjoy building robust frontend solutions while collaborating closely with backend engineers in a mature, monolithic technology environment.

Your Profile

We are looking for someone who:

  • Has at least 5 years of professional experience in frontend development.
  • Has strong, hands-on experience with React and modern JavaScript/TypeScript.
  • Has experience working within monolithic application architectures and understands the challenges and advantages of enterprise environments.
  • Enjoys collaborating closely with Java backend developers to deliver high-quality end-to-end solutions.
  • Is capable of working independently, taking ownership of tasks from analysis through delivery.
  • Communicates fluently in English (written and spoken). English is the only working language for this role.

Working Model

  • Location: Brussels, Belgium
  • Onsite Requirement: 50% onsite presence is mandatory. Candidates must be comfortable working from the client’s offices on a regular basis.
  • Contract Type: Freelance

What You’ll Do

  • Develop and maintain complex React-based frontend applications.
  • Work closely with Java backend developers to design and implement new features.
  • Contribute to technical discussions and solution design.
  • Deliver high-quality, maintainable, and scalable code.
  • Participate in code reviews and promote engineering best practices.

If you are a senior React developer who thrives in enterprise environments, enjoys close collaboration with backend teams, and is looking for a long-term freelance opportunity in Brussels, we’d love to hear from you.