About Me

Hi, I'm Koen! I'm a passionate & entrepreneurial JavaScript developer from the Netherlands who likes to push the web beyond it's limits. I specialize in modern frontend using React & 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.


  • 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).


References, code samples and a copy of my resume upon request.