The process took 1+ week. I interviewed at Jane Street in Jun 2011
Interview
nothing special. standard interview. brainteasers, some math. you have to understand probability + be prepared for the interview. some questions look strange and meaningless. actually do not know why they ask that. study conditional probability, event calculus, total probability. but most difficult is to apply knowledge to situation, because when you are on phone you are nervous + you forgot a lot + even simple questions look very difficult.
Interview questions [1]
Question 1
you asked someone to take a test. test contains 5 answers for each question. only one answer is correct. u look at finished test and see that given answer is right. what is the probability that test taker really knew (derived) the answer, not guessed?
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
