TMG seems like a great place to work. The interview process is thorough and challenging. I had a 20-hour programming test consisting of 8 small programs to write, and one large program to write. Some parts were more challenging than others but the programming was a lot of fun (if you're a programmer). Then I had a 10 hour written finance test. It wasn't terribly challenging (if you've taken a course that covers Hull's book - Options, Futures and other Derivatives, aka, the Derivatives Bible you'll be fine). Then about 3 rounds of phone interviews. One round was just personality fit, another reviewing answers to the finance written test, and another with statistics questions. After all of that they flew me out to Chicago. I went to dinner with two trade logic developers and had a great time - they seemed like great guys who really enjoyed their work. The next day was the in-person interview which took about 6-7 hours and I interviewed with about 10 different people - everyone from management to trade logic to traders. The questions were mostly programming and statistics related, with a few of them asking finance questions. The hardest part for me was the programming questions - which were extremely technical and C++ oriented - so know your C++ at an expert level. I got tripped up on some of the very technical C++ stuff (that I should have known but was a bit rusty at, at the time). Most of the interviewers were very pleasant and helped work through anything I struggled with - they're looking for correct answers and how you got to those answers. The unfortunate part of the process came after the interviews. Multiple emails sent over the course of weeks went un-responded. The lack of professionalism in HR was disappointing. Finally I received an apology for the lack of responses that said I was still in the running and that because they are a small firm a decision would take longer. I thanked them and waited for a response - which never came. While the company seems like a great place to work, it is made up of a lot of young people - which explains the lack of courtesy and professionalism. That being said the interview process was challenging and helped me in my other interviews with competing firms. My best advice is to be an expert on basic probability and statistics, have a deep and broad knowledge of financial derivatives, and especially have an expert knowledge of C++ (including things that the compiler does at compile time - things that happen in the background without you knowing). All in all it seems like a great place to work. The people there are very friendly and accommodating for the most part, just be warned that if you don't get picked you likely wont receive the professional courtesy of an email telling you so - they'll just leave you hanging indefinitely.

applied on OCR, and got a trader emailed me. First round is coding test in C++ and java, cost me around 6 hours. Second round was a test in finance problems such as vol smile. But the guy I was contacting kept missing my emails so I didnt even receive the test for round two.