The process took 1 day. I interviewed at Jane Street in Apr 2011
Interview
Just like many others' experience with Jane Street. First are a couple of mental arithmetic problems. Then progressed to probability, coin flipping and dice tossing. The interviewer was nice. And sometimes he offered me hints when I got stuck on a problem. Really nice talking with him.
Interview questions [1]
Question 1
Flip a coin. if head, I win 1 point. If tail, u win 1 point. The person who first wins 2 points wins the game. And the loser must pay winner $1. However, if I have a option which I can increase the stake of the game to $2/game, what is the value of such option.
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