CodeCrafters
ActiveProgramming courses for experienced engineers
What it does
Build your own Git, Redis, SQLite — in Go, Rust, Python, etc.
Its site says now · captured 2026-08-23
CodeCrafters | The Hardest Programming Challenges on the Internet
Build your own Redis, Git, SQLite, and more from scratch. Advanced challenges designed for experienced engineers, used by developers at Google, OpenAI, and Vercel.
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