I applied online. The process took 2 weeks. I interviewed at Jane Street (London, England) in Oct 2014
Interview
2 telephone interviews within the space of a week both with very friendly interviewers who asked a series of maths question, mainly probability-based. The interviewers gave helpful hints when I was stuck and seemed to be looking for someone who picks up new concepts quickly and has a strategic mind rather than someone who immediately finds the solutions to all the questions. We chatted a bit about what their daily job entailed.
Interview questions [1]
Question 1
What digit does 3 to the 33 end in?
How many 6 digit numbers are there that include all the digits from 1 to 6 inclusive?
What is the mean of all of these numbers?
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