I applied online. The process took 4 months. I interviewed at Jane Street
Interview
Had 4 phone interviews and an on-site day with another 4 interviews at the firm in London. The first phone interview was mainly testing my mental maths skills and being quick with calculating EVs and conditional probabilities. The other 3 phone interviews were more in depth and required coming up with solutions to problems they weren't sure of the correct answer either.
Interview questions [1]
Question 1
We are playing a game. You start with £100. I shall flip a fair coin. If the coin comes up heads, you add £1 to your previous sum of money. If it comes tails the sum you have gets inverted( i.e. you have £x, your sum becomes £(1/x). £100 goes to £0.01, £0.5 to £2 and so on). What is the expected amount of money you will end up with after 10 consecutive coin flips?
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
Trading applicants have rated the interview process at Jane Street with 3.8 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 71% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
Candidates applying for Trading roles take an average of 19 days to get hired, when considering 66 user submitted interviews for this role. To compare, the hiring process at Jane Street overall takes an average of 17 days.
Common stages of the interview process at Jane Street as a Trading according to 66 Glassdoor interviews include:
Phone interview: 52%
One on one interview: 17%
Skills test: 13%
Presentation: 6%
IQ intelligence test: 4%
Group panel interview: 4%
Background check: 3%
Other: 1%
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