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.
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.
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.
