There are many Physics/Maths graduates in FAANGs from my experience (and you only find it out if you ask them, i.e. there's no noticeable difference otherwise).

There are many Physics/Maths graduates in FAANGs from my experience (and you only find it out if you ask them, i.e. there's no noticeable difference otherwise). Your degree is certainly not holding you back, this is not medicine or law. I had to explain how to use std::function and lambdas to a fairly high level employee once (we were using C++). A Maths graduate (a PhD, actually). Problem? No, he was really good otherwise, and he got how it works in less than an hour. It is not complicated compared to what he normally did, he just happened to never need to use it in the past. Needless to say he wouldn't know how to do find-union or how to write a compiler or write a formal spec for a programming language or how to compute GCD with C++ metaprogramming or any other "theoretical" fun things you would learn before you get a CS degree. It's not that important.