First round on campus interview and the invited to the company for the final round, which comprised of eight interviews plus a math test. I don't have a background in finance/econ, but in math and CS. So most technical problems are math and CS related. (i.e., simple probability problems, algorithm design problems). For instance, give an algorithm to find that value of (n,m), n choose m, provided that the final answer will be fit in an integer type of variable (C/C++).
And of course, there is the tell me about yourself, what do you want to know about our company that kind of questions.