Writing code is easy now. You can build an app just by saying what you want. But things are very different in production. I'm a hands-on developer, and writing code may account for less than 10% of my total delivery time. Most of the rest goes into review and verification. No matter how far models advance, I never seem able to fully let go. I always have to run their code myself to see whether it meets the requirements correctly. This is the main bottleneck keeping me from delivering at scale. So the way I see it, the key to large-scale parallel delivery is letting models verify the code they write, and making that verification something we can trust. If I could keep only one of the Skills I've written over these two months, I'd keep the one that builds the verification environment: the agent starts the app itself, uses it like a user, then checks the results against a checklist organized by feature, with an ID for every criterion. I call it a feature map. How I built it and the problems I ran into are all in this article.