The first round consisted of a resume screen then a hackerrank round consisting of quickfire math questions, basic calculus, and moderately difficult statistics questions. I did not pass this round.
Hackerank OA which asked a series of maths problems. Very time pressured. Not standard probability or EV problems, more misc maths questions. Didnt get past this round, definitely the hardest OA i've seen.
I applied online. The process took 2 weeks. I interviewed at Five Rings (New York, NY) in Sep 2025
Interview
OA with difficult quick math and stats questions. Each question is like 2 min so need super fast reaction. Then there will be several rounds with difficult tech questions, mainly about math algorithm and statistics.
Interview questions [1]
Question 1
A classical question about dice: expectation of two 1 in a roll.
