I applied online, and the interview consists of online arithmetic test and personality test, followed by a web probability and arithmetic test. I got a phone interview with Andrew, but because of the poor reception, I could barely hear the interviewer and the call dropped 4 times during the call. Andrew was very nice and courteous to always called me back, which I really appreciated as I think as a head trader he is very busy, it shows respect for the candidate that he always dialed back. I think this is a good sign of a good corporate culture. The questions asked on the phone interview are fair, mostly just questions about options and math. The brainteaser are not difficult either (I am from a stats major). as I couldn't really hear him over the phone, I did not do too well, and always have to ask him to repeat, and after this round I was eliminated. I think if you prepare ahead of time, the interviews are fairly easy. It seems like they have very good culture compared to some of the stories I heard about trading firms.