Hey, I'm Stefan. I develop digital services and products.

Frontend nerd, organizer of the Web Performance Group Berlin, occasional teacher, curator of Perf Tooling Today, organizer of CSSclasses Berlin and Developer Evangelist at Contentful.

I also read a lot of newsletters and listen to a few podcasts, document my web dev learnings constantly and write a monthly newsletter.



  • Content modelling is tricky – ways to survive

  • Frontend Web Performance – Better, Faster, Stronger

  • Structured content & JS Components – a match made in heaven

Developer Smalltalk

  • Using Cypress for end-to-end testing with Gleb Bahmutov

  • Using ES modules in Node.js today using @std/esm with John-David Dalton

  • Setting up Sitespeed in AWS with Peter Hedenskog