The interview process is very technical. There were no behavioral (although I may have skipped such an interview because I attended an even that automatically gave me an interview). It was all probability and mathematical. Be sure to know your mental math and be able to solve problems under pressure. I had a hard time working out problems; I intuitively knew how to do them, but it was difficult to solve the math and give a numerical answer. My interviewer was not particularly helpful and so that made it harder.
Interview questions [1]
Question 1
If I had 4 coins and I flipped them and you get paid $1 for every head, what is the expectation of earnings? If I then said you had a magic wand and you could use it to tap on an even number of coins to flip them again, what would your expectation of earnings be? (i.e. you could either flip 2 or 4 coins).
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