Jane Street Interview Questions

Updated Aug 22, 2015
584 Interview Reviews

Interview Experience

Interview Experience

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Candidate Interview Reviews

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  1.  

    Software Developer Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Average Interview

    Application

    The process took 2+ months. I interviewed at Jane Street in February 2015.

    Interview

    Applied on company website and was contacted 3 weeks later for a phone interview. Four weeks after the interview was actually scheduled for 3 weeks later. They ended up calling 40 minutes late, the interviewer was very incompetent at even asking the questions. I found it very unprofessional and chose to not move on in the interviewing process after speaking with friends who told me this was not uncharacteristic of them.

    Interview Questions

    • Several basic binary tree questions that built off of each other in difficulty. From implementation to finding the depth to checking if the tree is symmetrical.   Answer Question
  2. Helpful (2)  

    Software Engineer Interview

    Anonymous Employee
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied online. The process took 3 weeks. I interviewed at Jane Street.

    Interview

    I applied online and didn't hear back for about two or three weeks. I was eventually contacted by a recruiter who scheduled a phone interview for me. The engineer that interviewed me was very friendly. I thought that I had done reasonably well during the coding problem, but I was not offered another interview. After asking for feedback on how I could do better on future interviews, I was told that none was documented.

    Interview Questions

    • I was asked what was essentially a tree construction problem. It was followed by questions regarding its runtime.   Answer Question
  3. Helpful (1)  

    Intern Interview

    Anonymous Employee
    No Offer
    Difficult Interview

    Interview

    First few rounds are entirely mental math skills based (no writing notes) Scheduled by HR person but interviews are by traders. Those traders might call a half hour to an hour later than the scheduled time. The first round is 3 math questions followed by guessing on how correct the previous answers were.

    Interview Questions

    • Which question do you most thing you were wrong about and how wrong were you?   Answer Question
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  5. Helpful (3)  

    Intern Interview

    Anonymous Employee
    No Offer
    Difficult Interview

    Application

    I applied online. I interviewed at Jane Street.

    Interview

    Applied online through website. Got an email asking for a time to have a phone interview. Phone interview was pretty intense - interviewer was in a hurry and did not seem to be patient.

    Interview Questions

    • How many times does the digit 1 appear in all numbers from 1-1000000 inclusive   7 Answers
  6. Helpful (3)  

    Trader Interview

    Anonymous Employee
    No Offer
    Average Interview

    Application

    I applied online. The process took a week. I interviewed at Jane Street.

    Interview

    Applied online the last day before deadline. HR phoned me the following Monday, went through my resume, and set a time for interview. Interview process: All maths, mostly probability and conditional probabilities. I thought I did all questions correct, but I guess it was too slow. They really expect you to come up with some smart short-cuts instead of standard solving process. Did not get into second round

    Interview Questions

    • A cube painted with red paint was divided into 27 smaller cubes (3*3*3). Randomly pick one and toss it. What is the probability that at least one of the sides that can be seen has paint on it.   5 Answers
  7.  

    Desktop Support Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Difficult Interview

    Application

    I applied online. The process took 1 day. I interviewed at Jane Street.

    Interview

    Three mandatory phone screens, one or more in-person interviews. The interview process is very extended. It could be weeks between phone screen sessions, they there are at least 3 phone screens. I felt the interview process was more self-gratifying for the interviewer than anything else. He/she told me about the great advantages the company has to offer, the fact that this person has been there for more than a decade and that they would never leave. They also spoke about how they use their own money for quantitative trades, and that they are a very "unique" and different "shop" than everyone else on the block.

    Interview Questions

    • "Please describe for me in every detail exactly how a new computer runs it's start up process. Take me through the entire boot process."   1 Answer
  8. Helpful (1)  

    Assistant Trader Interview

    Anonymous Employee
    No Offer
    Difficult Interview

    Application

    I applied online. I interviewed at Jane Street.

    Interview

    The interview was over the phone for about 45 minutes. I was asked three questions that had to with probability and the questions seemed a little unusual. They called a couple of minutes late and were good about it if i had to reschedule. they also allowed me to use paper and pencil.

    Interview Questions

    • You have two dices. There are two players. You each pick a number. The person who picks the number closest or equal to the sum of the roll of the dices is the winner. What is the strategy to optimize chances of winning. Also, is it always better to pick the number that has the highest chance of being rolled? This situation does not apply to the rules of this game. For example, this question could apply to the rules when the two numbers on the die are multiplied rather than added.   2 Answers
  9.  

    Software Engineer Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Difficult Interview

    Application

    I applied online. The process took 3 weeks. I interviewed at Jane Street.

    Interview

    Applied and was asked for an interview the next day (delayed interview, however, because I was too early for the intern interview process). Had an interview a few weeks later. It was difficult. I was asked to write a memoized form of a function, evaluate its time complexity, then memory. Then I was asked to improve its memory cost. The answer, I believe, was to implement some sort of LRU stack (which I said some form of), however the interviewer seemed to zone out about 15 minutes until the end of the interview. I must have been too slow to answer or something, because he zoned out and I heard typing on his end towards the end, so even if I got it in the end it was already a no.

    Interview Questions

    • He asked me to improve the memory cost   1 Answer
  10.  

    No Offer
    Neutral Experience
    Difficult Interview

    Application

    I applied online. I interviewed at Jane Street.

    Interview

    Applied online after seeing Jane Street at career fair, received email for interview, interviewer who was a programmer called me. Interview took about 45 minutes, consisted of 3 questions about probability and coding

    Interview Questions

  11. Helpful (2)  

    Trader Interview

    Anonymous Employee
    No Offer
    Positive Experience
    Difficult Interview

    Interview

    Applied online. A phone interview asking mental math like 78 * 0.13% or 43^2, probability questions, and brain-teasers. Problem solving ability like that used in competition mathematics is necessary to do well early on. Focus on those types of questions instead of behavioral ones.

    Interview Questions

    • Here's an easy one: You are given a six sided die. What is the expected value of the difference between the two dice rolls?   4 Answers

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