Claude Code can build most of an app in a day. The hard part isn't getting something that runs. It's getting something you'd confidently put in front of real users. The gap between those two is where nearly every project I've shipped with it started to unravel. The fix isn't a cleverer prompt. It's process. Here's what actually moved my builds from demo to something I'd deploy. Write the thing down before you write any code. Not a sentence in a prompt, an actual page: what it is, who it's for,