I'm Vojta Holik, co-founder of badass.dev and the design engineer behind some of the most successful developer courses on the internet.
Since 2018, I've been building custom course platforms with Joel Hooks (egghead.io) using our own CMS, Course Builder.
I've helped creators like Kent C. Dodds and Matt Pocock teach millions with fast, opinionated platforms used by teams at Apple, EA, Netflix, and more.
Matt wrote a plain-English dictionary of the words people throw around when they talk about AI coding. I designed and built the site for it, a 3D graph of 71 terms with 543 links between them. Click a term and the camera flies to it. Search, and everything that doesn't match fades out.
Coding agents know :has(), subgrid and anchor positioning. They rarely reach for them. I built good-css so they do. It packs 47 modern CSS techniques into an agent skill, and the site runs every one of them as a live specimen.
A clean laptop is a sad laptop. So I built a page where you stick Badass stickers on the lid of a 3D MacBook. I made the stickers too, with a tool I built for it. The music is made right in your browser and builds with every sticker. It's fun and you should try it.
Course Builder is the framework and CMS we build our course sites on. We put 10 years of building courses at egghead and Badass Courses into it. Every product listed below runs on it.
AI Hero is our first cohort-based course, built to be completed with an AI assistant. The first cohort in July 2025 had 1,000+ developers.
Total TypeScript is Matt Pocock's TypeScript training. In 2022, I played a big part in designing and building the site. Since then it has crossed $2.5M in sales.
Epic React launched in 2020 and made over $1M in sales in its first month. I did a lot of the design and development for it.
