About Me

Hi, I'm Koen! I'm a passionate and entrepreneurial JavaScript developer from the Netherlands who likes to push the web beyond its limits. I specialize in modern frontend using React and Svelte, and I also feel at home on the backend using Node/TypeScript. I'm interested in helping inspiring companies create innovative web apps that users love.

If you want to discuss an opportunity with me, feel free to reach out. Sometimes I'm available for hire for advice, mentoring or consulting.

This year, I joined Rabobank as a lead frontend developer. In my new role, I'll be helping others find their way around the complex environment of Rabobank. I hope to create a sense of community so that developers can more easily ask colleagues for help, conduct code reviews, share code snippets, and generally learn from each other. Of course, I will still be coding myself as well. I wouldn't want to miss that!


  • Platforms: Web, Node.js, Mobile (iOS)
  • Languages: JavaScript, TypeScript, HTML5, CSS3
  • Frameworks: React, React Native, Redux, Express, Next.js, Svelte, Sapper, jQuery
  • Tooling & Testing: react-testing-library, Webpack, Lerna, Babel, Jest, Nock, Detox, Cypress, Git, Unix
  • Knowledgeable: CI/CD, Testing, Monorepos, Single Page Apps, Accessibility, Server Side Rendering, Progressive Web Apps, Internationalization
  • Services: Docker, Gitlab CI, MongoDB, Postgresql, BuddyBuild, Mixpanel, Google Tag Manager, Heroku, AWS, Google Cloud, Jira, Sentry, Bugsnag


  • M.A. in Philosophy, Utrecht University (cum laude).
  • Minor in Computational Science, Utrecht University.
  • Erasmus Student Exchange, Universität Regensburg (Germany).