I build reai.no, an accounting system in Norway. I can say with 100% certainty that if you don't know what you're doing. Then it will still be a mess. I throw away 90% of the code that other devs come with and also from my own prompts.

I also tend to close PRs if I'm not sure it is the best solution and just ask them to start from scratch since the second time you implement something (unless you do it completely blindly) probably made you realise how you could make it simpler :)

I also focus a lot on teaching devs domain knowledge. Actually learning accounting so they can more independently understand how to build something "correctly".