I applied online. I interviewed at Jane Street (London, England)
Interview
Applied on website by submitting CV and cover letter. Had three phone interviews, the third one with a trader in NYC during his lunch break. First two rounds were relatively easy given that many questions are available online. In the third one I was asked a problem that probably couldn't be evaluated precisely with pen and paper, but required better intuition than I had, as well as trial-and-error.
Interview questions [1]
Question 1
With one die, suppose in a round, you earn the amount of dollars equal to the value of the upwards face of the die. Now also suppose after your first roll, you are given the opportunity to cancel your first and roll again, taking that value as the final value. What should your strategy be?
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