E396 - Inside Bun’s $165K AI-Powered Rust Rewrite

What normally takes a team of senior software engineers a year was completed in just 11 days.

In this episode of TechDaily.ai, David and Sophia explore the extraordinary story of Bun’s massive migration from Zig to Rust—an effort involving more than 535,000 lines of code, 64 parallel AI agents, roughly 16,000 compiler errors, 6,500 AI-generated commits, and a reported compute bill of $165,000.

But this wasn’t a matter of dropping a codebase into an AI chatbot and asking for a rewrite.

The migration required careful human planning, a highly detailed 600-line porting rulebook, isolated development enviro...