Applied online, contacted via email, first round phone interview, currently still in application process. The interview (first round) was about half an hour, no paper or pen. I responded to the critical thinking questions by talking through my reasoning and explaining my thought process to arrive at my answer. Interviewer was clear and encouraging.
Interview questions [1]
Question 1
If you have one hundred coins, at least one fair and at least one not fair, is the chance that you will get an even number of heads sometimes 1/2, always 1/2, or never 1/2?
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