Senior Front-end Developer (React / Next.js)

Your mission

• Design and build modern React / Next.js applications that stay maintainable as they grow.
• Make and defend architectural decisions - and understand the performance consequences of them.
• Set front-end standards, build reusable components, and create patterns the whole team builds on.
• Work closely with our back-end developers to integrate APIs and business logic cleanly.
• Own quality end to end, including in production: reading logs, tracing issues, and diagnosing incidents together with our DevOps and sysadmins rather than handing them off.
• Improve performance, accessibility, and overall UX across projects.
• Review code, raise the bar, and help good front-enders across our teams become even better - without slowing them down.

Your profile

• 5+ years in front-end development, with deep, current React and TypeScript experience.
• Real production experience with Next.js - you understand rendering strategies (SSR / SSG / ISR / CSR), hydration, routing, and when to use which, not just how to scaffold an app.
• A strong grasp of front-end architecture: component design, state management, and how structural choices affect maintainability, bundle size, and runtime performance.
• The ability to measure and improve performance (Core Web Vitals, bundle analysis, profiling) - and to understand the cost of the trade-offs you make.
• Solid experience integrating front-ends with APIs and back-end systems.
• Comfort across the full lifecycle: version control, testing, debugging, CI/CD, deployment, and maintenance.
• Excellent English and the confidence to work directly with product owners and clients.
• Senior judgment: you know when to be rigorous and when to be pragmatic, you take ownership of outcomes, and you make the people around you better.

Nice to have: Python/Django and SQL (you'll work closely with our back-end teams), real depth in accessibility, a good design sensibility, or experience setting standards within a team.

Why us?

• Challenging custom software projects.
• A highly skilled and technical team.
• Short communication lines and little bureaucracy.
• Significant influence on front-end architecture and development standards.
• Opportunities to improve processes and shape the future of front-end development within the company.
• A culture that values expertise, ownership, and continuous improvement.
• A salary between €3000 - €5000,- based on experience.
• A training budget for courses, certifications, and industry events.
• 25 vacation days to ensure sufficient rest and relaxation.
• An attractive (optional) pension plan in which we double your contribution.
• A company laptop and phone.
• Flexible working hours that you can arrange yourself.
• Hybrid working is fully supported.
• Fun outings with your team and the chance to challenge your colleagues to a game of table tennis, chess, or pool.