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.

Blog

Slides

I didn't know that!
Slides

Patience and the right tools – ways to handle  content model changes
- Contentful
Slides Recording

Frontend development 2018 – what's in your stack?

Watch on YouTube
Sun Feb 11 2018
Using Cypress for end-to-end testing with Gleb Bahmutov
- Testing
Watch on YouTube
Thu Jan 25 2018
Using ES modules in Node.js today using @std/esm with John-David Dalton
- JavaScript
- Node.js
Watch on YouTube
Wed Dec 13 2017
Setting up Sitespeed in AWS with Peter Hedenskog
- Performance