I was a midweight dev acting as a lead dev on the frontend development of a project. I had already built most of it, it was all vanilla JavaScript, had no jQuery, the code was simple, fast, and small. Then I went on holiday and the company put a senior lead on the project to carry out remaining work while I was away.

When I came back, there was a bug in the age gate page and I started to investigate. I then noticed that the asshole added jQuery to the code just to select the country and date of birth input fields. That idiot, a senior lead dev earning more than twice what I earned, didn’t know how to select some elements on a page! I nearly lost my temper when I saw the added bloat.