Multiple Rounds, first was behavioral and second was technical. They first did a pretty lengthy behavioral and seemed pretty good, but then the technical was mainly all Fermi estimations and market making games.
Other Quant Trader Intern interview reviews for Optiver
Got an online assessment which were a variety of different cognitive tests. You needed to be quick to deduce the pattern (+ quick calculations) with sequences. Probability questions were tricky as well, best to prepare your stats prior the OA. After the OA, a behavioural screen (20-30mins) with their recruiters and then the technical interviews.
Definitely a challenging interview process but was enjoyable to try and solve.
OA for Round 1, involves a lot of quick calculations and estimations. Behavioural interview, Technical interviews and final superday. Final superday involves many interviews, but I did not reach that part.
Interview questions [1]
Question 1
Why trading? Have you applied to any other places?