I applied online. I interviewed at Jane Street (London, England) in Sept 2017
Interview
First round interview on telephone. It was the HR calling me but it's all technical questions. They do not permit you to use pen, paper and calculator. Very challenging problem in calculating probability of dice rolling for the last two questions. They would not let you know if your answer is correct, and if you say this is my answer, they will go on to the next question.
Interview questions [1]
Question 1
Two dice rolling questions, angle of clock hands, expected value of 20 faced dice.
The process was structured and intellectually challenging. It typically involves an initial recruiter screen, followed by probability, mental math, expected value, and game-style problem-solving interviews. Interviewers focus more on reasoning, communication, and adapting to feedback than memorized answers.
Interview questions [1]
Question 1
You have two opaque boxes in front of you. At each turn, you may choose one of two actions:
Place: put one coin into one of the two boxes, chosen uniformly at random.
Take: choose one of the two boxes uniformly at random, take all the coins inside, and empty that box.
You play for exactly 100 turns. Your goal is to maximize the expected number of coins you collect.
What is your optimal strategy?
Several phone calls to go to the final round. The phone calls consists of mathematical, probabilistic brain teasers which was not that hard for a mathematics major. Final round was to harsh for me, strong mentality is required
I applied online. The process took 4 weeks. I interviewed at Jane Street (New York, NY) in Apr 2026
Interview
Lots of expectation/probability questions. Make sure to study game-theory type question that involves expectations. Specific concepts in stochastic processes don't seem that important. The first two were relatively easy. Just make sure to ask a question if there is any uncertainty