The team had 2,147 files to migrate. Every import, every component, every pattern - all had to change. At normal pace: three months of assembly-line engineering work.

They built a pipeline with Claude Code running headless - no human in the loop. 20 parallel instances, automated validation, a retry queue for failures. Four hours of processing. 80% cleaned on first pass.

API cost: a few hundred dollars. Manual equivalent: hundreds of thousands in salaries.

The full architecture - phases, prompts, and how they improved mid-run - is here.

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P.S. What's the most tedious migration or refactor your team keeps putting off? Hit reply - that's exactly the kind of thing this approach was built for.