Quite hard, few probability questions but they did give hints
Interviewer was nice, hour long interview with mostly technical questions and a few behavioral questions (tell me about yourself)...
The interviewer said there were a couple of rounds to get the winternship role
Average interview
Application
I interviewed at Five Rings
Interview
The whole thing was like 15 minutes. After some very basic HR questions, I got 10 math problems, half a minute for each. The interviewer was helpful. I heard back from them in 3 days.
OA was on mental math, probability, and geometry. You need to answer the questions extremely quickly. Make sure you are submitting your answers correctly as the software is a little awkward.
Only did the OA, got questions such as estimating the Arc length of sin(x) from 0 to pi. Is rapid fire, with ~20 mins for 15 of these difficult questions.