I was shortly in a project where the team and the customer meant the fucking Oracle DB when they were talking about "the backend".

There was Java Spring Boot (on some outdated, old old version), but all it did was pass args from a "REST" API (doing essentially RPCs with POSTs is REST, right?) to the DB.

The DB then had functions upon functions written in pl/sql that did the actual work.

I have no idea who the fuck thought that that was even remotely a good idea.

Anyways - I am happy to have moved on to better, more sensible projects :D