> Take with a grain of salt, but I have heard of some folks explicitly getting permission to do hiring outside of HR at said large companies. The kids they get out of undergrad and through HR's Leetcode process are apparently complete garbage. Don't understand C, pointers, memory, or Linux at all. Don't even know what files are.

I've done a lot of interviews, and I just accept that I need to explain what a byte is to the candidates. You'd think people with a programming background would know what they are, but it's not a hard concept, so whatever. I don't really care if they know how to open a file or what a byte is, I want to know if they can describe their output, and then write code that does what they said. And if they can write a loop with a loop in it without going off the rails. Bonus points if they can communicate reasonably throughout. You can teach someone how to use files, and unless you're a C shop, most people don't need to use that much C that they can't learn it when it comes up, if they need to. But it's hard to teach 'make a spec, follow the spec you made' and if you have to teach a programmer how to do nested loops, they aren't a programmer yet. (which is maybe fine, if you're interviewing someone who's only programming adjacent or something)