Jane Street Capital Assistant Trader Interview Questions & Reviews

Interview Details – A number of very technical questions are asked, such as the coins problems.

Interview Details – I applied on university career website and got a first round interview. Before the interview I received an email from HR saying there's no need to dress up. Interviewer did wear jeans. There were no behavioral questions, all they cared about is your math ability and logic. I answered most questions correctly and quickly, but got the last question wrong.

Interview Details – Began with basic mental math and probability. Wasn't in the right mindset and got stumped by the following question that really isn't too bad in retrospect:

If the probability of of seeing at least 1 car in an hour is 544/625, what's the probability of seeing no cars in a 15 minute interval?

Interview Details – Only undertook the first two phone interview stages. Questions were purely probability based, and lasted around 30 min each. Question themes were on coin flip probabilities, probability of it raining on at least one of the days of the weekend given probability of it raining on one of the days. Concentrated on Bayesian statistics, expected values, and simple statistics.

Interview Details – Had 1st round on campus. The interviewer was really nice and made the environment as comfortable as possible.

Interview Details – 5 rounds of phone, last round on site

Interview Details – Extremely unprofessional. Didn't call as per schedule, rescheduled again.. and they didn't call again. What a waste of time during peak interview and recruiting season. Don't waste your time, you're better off at a Mcdonald's.

Interview Details – Telephone Interview ( Round 2 of 5 )

Entire process involves 3 phone interviews, then a subsequent 2 at London office. You can get rejected after any stage.

Interview Details – As with many other interview experiences the process was completely technical - no fit questions.

First interview started with the usual JSC questions - subtract two numbers, multiply two 2-digit numbers, take a percentage (17% of 29 type thing). All mental arithmetic. Standard probability questions after that to do with coin flips and expected values (flip four coins, expected no. of heads, flip again if you want given pay £1 for every head, expected value of game). Also confidence levels (%) for answers - make sure if you give individual confidence intervals for separate answers you can give an overall for all three combined (i.e. prob that all three are correct).

Second interview was similar but slightly more complicated - not difficult if you have taken a standard uni level probability course in expectations distributions. Make sure you talk through your answers.

Didn't get any further than that as I messed up a question but all in all the interviewers were helpful and try to guide you towards the right answer, just don't expect to have a conversation about the weather or build rapport with them.