I submitted my resume through campus career service's website. I was contacted a couple of weeks later to set up a phone interview. The initial interview is intense. The interviewer, a current trader, was at times adversarial and rude, while at other times funny and super laid back. Expect a lot of questions about why you are interested in trading, what you want to trade, and financial markets in general. There are several brain teasers and guesstimates thrown in with other random questions, but I didn't find them too tough. I think more than anything they are gauging confidence, so just be firm in whatever your answer is, even if it's wrong.