I passed the interviews at one of the top stat arb hft firms and it sounds like there are a couple of responses from similar shops here. One thing people haven't mentioned: pedigree. I passed 3 rounds of interviews and my final interviewer was batting for me, when I didn't get the offer, he said the team was apprehensive because I didn't have the pedigree from MIT/Princeton like everyone else. He wasn't a fan of the decision because he worked at a string of failed startups himself prior to starting there, c'est la vie. Also for the curious, he said the salary range was 400-460k with ~3-5 yoe.