I applied through university. The process took 5 days. I interviewed at Jane Street (Cambridge, England) in Nov 2015
Interview
very hard. I guess they can afford to be picky with who they recruit. you must be very sharp and quick to answer the questions satisfactorily for them. very hard. I guess they can afford to be picky with who they recruit. you must be very sharp and quick to answer the questions satisfactorily for them.
Interview questions [1]
Question 1
Given two bowling balls and one weighs X kg, they are the same density, if this bowling ball is 10 inches diameter and the other is 16 inches diameter, how much does it weight?
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