Just a week ago I did a little side-job for a client who was previously helped by a moderately-sized web development company (100+ employees) with a WordPress site. They were too expensive for him.

There's so much I could say about the crap I found (and if someone asks I'll be happy to!), but I can summarize it by saying that it was bad even compared to the what I've come to expect from WP sites that are plugin- and WYSIWYG-layout-builder-laden, to the point of being utterly unmanageable from the WP backend interface, even on a local setup, because just exploring the ridiculous custom interface pages take ages to load.

I truly cannot imagine this code being written by anyone but a lowly, unsupervised intern at this company. And yet, based on my experience, it was probably just some 'regular' employee, unnoticed by his manager, and his manager, and the client none the wiser because how should he be able to assess competence.