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Closed-loop development: how we shipped Mac runners in 3 weeks

calendar_today April 16, 2026 person Aditya Maru domain blacksmith-sh

Blacksmith shipped Mac runners in three weeks using “closed-loop development” with AI agents that could self-verify work across four iterative phases: VM booting, filesystem setup, fleet deployment, and end-to-end testing. The approach minimized human context-switching compared to their three-month Windows runner development cycle.

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