Quantitative Engineer

Unnecessarily hard in terms of mathematical rigor considering I was being interviewed by model validation lol. I was asked if I knew what a singleton class was, said no, and then she proceeded to ask me to code it in Python right after I said I didn't know what it was.
Not practical at all, asked to derive convolutions of uniform random variables (like fully integrate them). Also basic brainteasers and leetcode (maximum profit) but that was fine. Also there was an easy hacker rank beforehand.