I applied online. The process took 5 weeks. I interviewed at Jane Street
Interview
Telephone interview to begin with, then was called back for an in person interview at their London offices, not sure how much they actually used the telephone interview results, it wasn't by someone with a mathematical background. In the face to face interview, questions were, once we got beyond pleasantries, entirely maths/stats/probability based. For example, as an easy starter I was first asked the expected value of the total of the scores shown on two fair, six-sided dice.
Interview questions [1]
Question 1
They asked me what the probability was of getting the same result shown across three events; the value shown on a single die, the value shown on a random card from a standard deck of 52 (with aces counting as 1), and the score on a roulette wheel.
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
