I applied online. The process took 3 weeks. I interviewed at Five Rings in Apr 2021
Interview
The first interview was quick and only takes about fifteen to twenty minutes, it is some quick math problems then estimation problems. The following two interviews each take about one hour and are both probability problems.
Interview questions [1]
Question 1
from one of the later two interviews:
how much would you pay to enter a game (where you flip a coin, and get 5 dollars if it's a head, 0 dollar if it's a tail
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
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.