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Dev tools · February 27, 2020

CodeCrafters

Hardcore, hands-on programming challenges

CodeCrafters launched on February 27, 2020 with 8 votes, #904 of 3,162 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 6 years on.

Visit codecrafters.io ↗CodeCrafters alternatives

What it does

CodeCrafters builds upon the popularity of https://github.com/danistefanovic/build-your-own-x tutorials, packaging them as fun challenges and making them accessible to a wider audience.

Build your own Redis, Git, SQLite, and more from scratch. Advanced challenges designed for experienced engineers, used by developers at Google, OpenAI, and Vercel.

Rebuild the tools you use every day with your own hands. Recreate Redis, Git, SQLite - from scratch, in your language, in your IDE. Pick a challenge, open your editor, git push to test. That's it. 11 challenges that take you inside the architecture of real systems. No toy projects. No algorithm drills. We strive to provide a proper workout. You won't become a great swimmer by watching the Olympics on YouTube. The Redis challenge was extremely fun. I ended up having to read Redis protocol specification doc pretty carefully in its entirety! The result felt like lightly-guided independent study, if that makes sense. (Which, again, was lots of fun) I've started the SQLite challenge, enjoying it…from codecrafters.io

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