I hardly think binary search is an unknown algorithm even by beginner standards for someone from a completely different field

https://xkcd.com/2501

I know a lot of professional, highly paid SWEs and DevOps people who never went to college or had any formal CS or math education beyond high school math. I have a friend who figured out complexity analysis by himself on the job trying to fix up some shitty legacy code. Guy never got past Algebra in school.

(If you're about to ask how they can get jobs while new grads can't - by being able to work on really fucking terrible legacy code and live in flyover states away from big cities.)