One engineer with a phone can now outpace an entire team's review capacity

How to Build an AI Software Factory: Agents That Open, Review, and Merge PRs

An AI software factory is the infrastructure around a coding agent, not the agent itself. It has five stages—intake, isolation, tools, verification, and merge gate—each with a gate that stops work from moving forward. Companies like Stripe, Spotify, and Shopify built the gates before scaling the fleet. The core problem is that generation scales with spend while review does not, so the design must absorb agent output without drowning reviewers.