To me that sounds exactly like what I would expect from some of the junior developers I’ve met in recent years. Most of the business logic in JavaScript. Poor modeling of a client-server relationship, and no consideration of which parts of the system can be trusted. The design was based on the non-technical requirements doc or the mockups, and an inexperienced front-end developer asked the inexperienced backend guy (or maybe they’re the same person) for an endpoint, and for the inputs, he mapped directly the fields in the form.

Thankfully, even AI writes better code than this, so as this type of developer quickly becomes unemployable over the next few years, I think we’ll see a temporary increase in code quality.