I have received the written exam invitation 2 months after I applied online. It's basically a group pre-test, focus on technical questions. Paper Exam with 73 questions lasts for 60 minutes. In the programming part, you can choose between Java and C++, or both, not so much about the code, but basic concepts and ideas of the programming. We have 50ish students in the 2nd section in the afternoon, they will get back to you within two weeks if you pass the exam.

First round written test including everything. Including linear algebra, statistics, stochastic process, derivative and programming. Then a phone interview asking very hard probability questions and derivatives questions. I didn't solve one the probability question and received reject letter.