Field notes

How MyBlueBerry got built: a series on shipping a private, one-handed baby tracker in under ten weeks of paternity leave, with an AI pair programmer doing half the typing.

I shipped an iOS app on paternity leave, with Claude

Post 1 · July 2026. The numbers behind the build: 477 commits, 64,286 lines of Swift with a ~1:1 test-to-code ratio, 1 GB of AI conversation, 4,404 tool calls, and 580 CI runs — plus why the app exists at all.

More posts are coming: the token bill, each role in detail, and whether an AI stack can run the store after launch.