Jane Street Interview Questions

Updated Jul 17, 2015
575 Interview Reviews

Interview Experience

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Candidate Interview Reviews

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  1.  

    Desktop Support Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Difficult Interview

    Application

    I applied online. The process took 1 dayinterviewed 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
  2. Helpful (2)  

    Trader Interview

    Anonymous Employee
    No Offer
    Average Interview

    Application

    I applied online. The process took a weekinterviewed 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
  3. Helpful (1)  

    Assistant Trader Interview

    Anonymous Employee
    No Offer
    Difficult Interview

    Application

    I applied online – 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
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  5.  

    Software Engineer Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Difficult Interview

    Application

    I applied online. The process took 3 weeksinterviewed 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
  6.  

    No Offer
    Neutral Experience
    Difficult Interview

    Application

    I applied online – 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

  7. 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
  8.  

    Trader Interview

    Anonymous Employee
    No Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 3+ monthsinterviewed at Jane Street.

    Interview

    first online test. second phone interview. the phone interview is a pretty nice girl, she told me she worked there for 1 year and trade equities. During the interview, she is still trading, I felt she is really a smart girl(I love smart girl).

    Interview Questions

    • there are 3 problems presented during the phone interview. the first two could be found here. I only give 3rd problem: I am thinking about two positive integers: a and b. I can tell you a/b is belong to the close interval [0.48, 0.52], then give me all the possible values for b no matter what value a takes.   2 Answers
  9. Helpful (1)  

    Trading Interview

    Anonymous Employee
    No Offer
    Difficult Interview

    Application

    I applied online – interviewed at Jane Street.

    Interview

    Applied online, contacted via email, first round phone interview, currently still in application process. The interview (first round) was about half an hour, no paper or pen. I responded to the critical thinking questions by talking through my reasoning and explaining my thought process to arrive at my answer. Interviewer was clear and encouraging.

    Interview Questions

    • If you have one hundred coins, at least one fair and at least one not fair, is the chance that you will get an even number of heads sometimes 1/2, always 1/2, or never 1/2?   2 Answers
  10. Helpful (2)  

    Trader Interview

    Anonymous Employee
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied through college or university. The process took 4+ weeksinterviewed at Jane Street.

    Interview

    I applied through my university. I got a reply scheduling an interview on campus. The interview was 30 minutes of quick mental math and probability questions. The questions were not difficult but you have to be able to answer quickly and walk the interviewer through the problem without hesitation. They did not ask any behavioral questions or anything about my resume.

    Interview Questions

    • Expected value of a dice if you can reroll up to 3 times and take the highest number.   2 Answers
  11. Helpful (1)  

    Trader Interview

    Anonymous Employee
    No Offer
    Positive Experience

    Application

    I applied online. The process took 3 weeksinterviewed at Jane Street.

    Interview

    Applied online through their website for student recruiting. Heard back within 2 weeks. First round interview mainly computation and probability. Heard back within two days. Fairly difficult but manageable for quant savvy applicants. Interviewer was clear and understanding. Gave hints toward solutions or mistakes when needed.

    Interview Questions

See What Jane Street Employees Are Saying

 Former Trader

Pros: “if you do well at Jane Street, you'll easily make six figures. The partners make seven figures.”“if you do well at Jane Street, you'll easily make six figures. The partners make seven figures.” – Full Review

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