73.6k-star free course AI Engineering From Scratch: 542 lessons building AI by hand
bigaiguy · x · 2026-11-04
The open-source course AI Engineering From Scratch has 73.6k stars, hit #1 on GitHub Trending, and is free/MIT with no setup required.
Key facts:
- 542 lessons across 20 phases in Python, TypeScript, Rust, and Julia (306 hours total; skip-ahead paths at Phase 10 100h or Phase 14 60h)
- You implement model internals, retrieval pipelines, and agent runtimes yourself, then test and inspect failures
- Focused paths: MCP (17 lessons, 23h), Agent Skills (5 lessons, 9.5h)
- Projects: a Retrieval Evaluation Lab in Python, an Agent Trace Debugger in TypeScript, a Tool Call Firewall in Rust
- Each lesson requires "receipts" — you keep the code and evaluation results
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