Ask HN: What companies have jobs in low-level programming?

Hello all, I am a current Java backend engineer, but I am taking an OS course and I am really enjoy it.

I am still very junior (YOE 1.25) but I am thinking of making a job jump to a systems programming SWE position.

I know Microsoft and Apple have positions obviously doing OS stuff, but any other companies I should consider? I think my preference would to be a bit higher than embedded engineering, but I wouldn't rule those out completely.

I should mention I have experience (in my free time, not work experience) in C/C++/Rust/Go. I don't do any objective-C or Swift so I don't know if Apple would be an option.

Thanks!