> They just want their invoicing system to just f-ing work for a change.

Time will tell, but I'm dubious this will hold longer-term. I don't doubt that Claude can write the code, but I am dubious Claude can manage it sanely. Does it have backups? Does the guy that wrote it know how to restore those, or can Claude do it? Can Claude upgrade the backend and/or migrate the data when the backend changes, or is this going to be running known CVEs in a month?

This has sort of always been a thing via hiring CS students as interns. I don't doubt most of them could jam out something that looks like Slack or Gmail. The problems aren't apparent immediately, they become apparent when you realize it doesn't handle invalid responses well and the backups are hosed so you just lost a bunch of data.