These guys bring in interviewees from competitors just to ask them what their competitors are doing, where they're making money and try to steal ideas without any intention of actually hiring. Questions were less about my experience or skills and far more about what the firm was doing. Extremely shady practice, recommend not sharing any details once they start asking these questions as they have no interest in the candidate. Their interview process starts with the head of the entire business so that they can interrogate you on strategies. This is not usually the case in traditional hiring processes.

OA then interview. Waiting to see if I passed. Very interesting interview with classic probability questions (coin flips, dice roll etc.). Writing more to fill the word limit but have no more to say.

Overall Difficult interview. Instead of the ability of basic calculation, a lot of probability and matrix involved questions asked. Review linear algebra for preparation. Questions may be on the mathematical end and being tricky.