the project was iOS app and vibe coded in Claude Code - it was around half year ago so maybe things improved. Client actually knew some coding so actually quite impressive how far they did manage to go along.

However it was just adding pile of feature after features without taking time to refactor it. Client most likely did some few different attempts to add some specific feature or fixing something and there was a lot of dead code that haven't been used. This dead code actually confused AI and often tried to modify part of code that have been abandoned.

There was completely no tests. No performance tests. And some part of my job was to improve performance (cv/ai model inference) and robustness (crashes, memory leaks).

I think AI is fine and useful but whats bad with such vibe coded project if somebody hand over to you is you have completely no clue what part of the code are written/designed properly with good foundation if previous developer didn't test extensively and didn't refactor continuously. Even worse if you cannot talk to previous developer responsible for the project.

Not OP, but I’ve spent months cleaning up sqlalchemy models that were written in isolation using AI. Project was just not scalable.