I applied online. The process took 2 weeks. I interviewed at Five Rings in Oct 2023
Interview
First round: Self introduction + quick ask quick answer. Only 30~45 sec for each problem. There were 15 problems in total. Totally disaster but still move forward.
Second round: kinda bad experience. The interviewer was late for about 10 mins. And he switched among laptop, conference room camera and phone. The question was about poisson process.
Interview questions [1]
Question 1
Green book. The Poisson process problem. Derivation of poisson distribution. Waiting time expectation. And some extension.
Five Rings’ Online Assessment 19 questions, 2 or 3 minutes. Tests mental math, estimation, combinatorics, quick logic, and probability intuition—very speed-intensive. After finishing OA, I received rejection within just 10 minutes.
Online assessment on probability questions. Each question has either 2 or 3 minutes limit. After that I had a short HR call. Did one technical round with a researcher who asked me about algorithm.
Interview questions [1]
Question 1
HR said the tech interview will be on probability but being asked algorithm.
Online interview with HR person firing maths questions at me. Was unable to clarify on the questions being asked, so I don't think she understood the questions she was asking. Very frustrating experience