There are OS/systems jobs at most of the big companies (Google, Apple, MS, etc). Really, I'd bet that any company that deals with serious traffic (e.g. Netflix)

There are OS/systems jobs at most of the big companies (Google, Apple, MS, etc). Really, I'd bet that any company that deals with serious traffic (e.g. Netflix) probably does some kernel hacking. There are HFT jobs to be had for pure CS folks, too --- especially in Chicago.