Senior JavaScript frontend Engineer

Xpower is a Belgian SaaS company developing B2B web applications including HyperPortal (a no-code automation platform) and HyperBuilder (a website builder). We are seeking a Senior JavaScript Frontend Engineer with strong UI/UX sensibility to develop large-scale, complex products.

• Develop and maintain frontend architecture for large-scale SaaS platforms
• Build complex, scalable React applications with modern JavaScript/TypeScript standards
• Implement state management solutions and reactive programming with RxJS
• Write comprehensive unit tests and ensure code quality
• Take ownership of features from architectural decisions through release and ongoing support
• Influence technology stack, development processes, and team structure

• 6+ years commercial experience in front-end or full-stack development
• Proven experience building large-scale, complex SaaS platforms and enterprise solutions
• Deep knowledge of JavaScript and TypeScript (ES5+, ES6+, modern standards)
• Strong practical experience with RxJS and reactive programming
• In-depth understanding of React architecture and scalable application design
• Experience with state management solutions (Redux, MobX, or similar)
• Hands-on experience with unit testing frameworks (Karma, Jasmine, Jest)
• Solid understanding of microservices architecture and its frontend implications
• Strong ownership mindset and responsibility for product quality

Work Arrangement: Flexible working schedule with remote or hybrid work format

Benefits: Participation in long-term product development with real technical autonomy and opportunity to influence technology decisions