Whats the deal with these places? Talking HRT, Two Sigma, Citadel, Optiver, etc. Do you need insanely specialized C++ skillz, go to a top school, or just LC? Super high IQ? Or all of the above? Is it a practical goal to have? I hear people say they mainly recruit out of top colleges. Would love to get some insight about who they look for and the interview process. Thanks!
Another question: could you get the level matching if you are senior or principal in regular big tech company?