CodeCrafters (YC S22)
Recreate your favorite developer tools from scratch
CodeCrafters (YC S22) launched on May 18, 2023 with 205 votes, #154 of 4,910 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 3 years on.
What it does
CodeCrafters makes interactive courses for software engineers, where you get to recreate popular developer tools from scratch. Build your own Redis, Git, Docker, and SQLite—in Go, Python, Rust, etc.
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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Learn by rebuilding Redis, Git, a database from scratchJul 2026 · shipthatcode.com · ▲200Learn programming by building real systems from scratch. Redis, Git, a database, a compiler — every lesson is choose, write, run.
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