2 math tests before telephone interviews the first barrier math test consists of 80 simple calculations, 8 minutes to finish. I did it on the University Career Fair. I guess this must be done onsite with the supervising from Optiver staff. I got a call from HR serveral days after the test told me I passed the first test and confirmed with me the second test. the second test consists of around 30 questions, all about finding number sequences. I did it in my University. So these tests all should be done under the eyes of Optiver, in case someone may have gotten help. After passing these two tests, I got a phone interview with the HR. It is a pretty standardized interviews, basiclly about your resume, experience, motivation and cultrue fit. But make sure you have some shinning points to convicne them you are the one they need, not anyone else. For exampe, tell them your connection with trading, or at least calculation or risk involved activities. Unfortunately I did not pass the phone interview, probably because of the culture fit.