The MVP AI built in a weekend. The rebuild cost $40K.

Four days to build. Six weeks to unbreak.

A founder came to me with an MVP, an AI tool put together over a weekend. Login, payments, dashboard, all working. Investors were interested. The waitlist was converting.

Then two users tried to upgrade their plan at the same time, and the whole payment flow broke.

We rebuilt the backend from scratch. Six weeks, just over $40K. Not because the idea was bad. Because nobody checked what the fast version was actually standing on before real users touched it.

I've seen this same story enough times now to stop calling it bad luck. AI gets you to a demo faster than anything in 18 years of doing this. It does not know the difference between code that looks like it works and code built to hold weight.

The one step that would have saved this founder $40K: before real users arrive, have a senior engineer check what the fast version is standing on. Auth, payments and the data model. Keep what holds weight, fix what doesn't. It costs days, not months.