I interviewed at Jane Street (Hong Kong) in Oct 2013
Interview
1st round: Friendly atmosphere. All the questions are about mental math. No special trick involves.
Interview questions [1]
Question 1
No unexpected question. Question: 37^2 = ? Paint a white cube red. Divide it into 27 same small cubes. Pick one small cube randomly and roll. What's the probability of all 5 faces you can see is white?
I had a phone screening call from a recruiter, they asked some standard probability questions, bayes rule, and expected value about dices. Overall experience was pretty good. Make sure you prepare your probability
Interview questions [1]
Question 1
Expected value, if throwing a dice, 2 dices and 3 dices with option to reroll.
I applied online. I interviewed at Jane Street in Nov 2022
Interview
Very smooth. Around 30mins first round 1hr for the second round. First round consisted of easier probability based questions. Second round was similar but harder and longer questions. The interview process if approached in a calm composed manner should be easier to analyse
multiple phone interviews and a full-day Zoom interview. Interviews got longer and longer over time, but every person was very kind and helpful with hints when I got stuck. The questions get harder as the rounds progress and generally don't have a closed form answer in the later rounds
Interview questions [1]
Question 1
they describe the rules of a game and ask if you want to play it based on your expected earnings