I have a hobby project on the side involving radio digital signal processing in Rust that I've been pure vibe coding, just out of curiosity to see how far I can get. On more than one occasion the hobby project has gotten bogged down in a bug that is immensely challenging to resolve. And since the project isn't in an area I have experience with, and since I don't have a solid "theory of the program", since it's a gray box because I've been vibe coding it, I've definitely seen CC get stuck and introduce regressions in tricky issues we previously worked through.

The use of Claude Code with my day job has been quite different. In my day job, I understand the code and review it carefully, and CC has been a big help.