Engineer's 221-Hour matmul Deep Dive Earns Anthropic Interview

Aleksa Gordić recounts spending 221.5 hours over 25 days optimizing matmul, which landed him an Anthropic interview, and reflects that tools like Codex and Claude Code have made his old habit of reading vLLM source code line by line with a debugger obsolete.

2026-10-28 ~ 2026-10-28 · 3 related posts

• 25 days, 221 hours of deep work on a matmul blog earned an Anthropic interview — gordic_aleksa · 2026-10-28
• He Read vLLM Line by Line for Hours—Now With Codex He'd Never Do It Again — gordic_aleksa · 2026-10-28
• Dev read vLLM codebase line-by-line with a debugger for hours — wouldn't do it again with AI agents — gordic_aleksa · 2026-10-28