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Jane Street Quant Interview Questions

16 Interview Reviews

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  1.  

    Quant Interview

    Anonymous Interview Candidate in New York, NY
    Anonymous Interview Candidate in New York, NY
    Application Details

    The process took a dayinterviewed at Jane Street in November 2011.

    Interview Details

    Standard quant phone interview. Thirty minutes and a few brainteasers.

    Interview Questions
    • Unfair coin with P(H) = 1/3 and P(T) = 2/3.
      a) How to make an event with 50% probability?
      b) Expected number of flips until a realization occurs?
      c) Can you create a strategy to reduce the number of flips necessary?
      d) Can you create a strategy to reduce the number of flips necessary for an unfair coin with any bias?
        View Answers (5)
    • 2) Alice and Bob play baseball for two periods. Can Alice have a better batting average than Bob in the first period but Bob have a better batting average overall?   View Answer
    No Offer
    Neutral Experience
    Average Interview
  2. 1 person found this helpful  

    Quant Internship Interview

    Anonymous Interview Candidate in New York, NY
    Anonymous Interview Candidate in New York, NY
    Application Details

    I applied online. The process took a dayinterviewed at Jane Street in April 2011.

    Interview Details

    There are 3 phone interviews, after which you have to send a code sample and finally you have an onsite interview.
    People on the phone were nice. They first asked me about my CV and then some brain teasers involving probability. It was not too difficult... I should have definitely done better.

    Interview Questions
    • You have 100 marbles, 50 are blue, 50 are red. You want to distribute them between two drawers, in such a way that none is left outside and no drawer is left empty.
      After distributing them you are gonna select a drawer randomly and from that drawer you are gonna remove one marble randomly.
      How do you distribute the marbles in such a way that the probability of getting a red marble is maximized?
        View Answers (6)
    No Offer
    Neutral Experience
    Average Interview
  3. 1 person found this helpful  

    Quant Interview

    Anonymous Interview Candidate in New York, NY
    Anonymous Interview Candidate in New York, NY
    Application Details

    I applied online. The process took a dayinterviewed at Jane Street in October 2010.

    Interview Details

    The first two rounds of interviews were with researchers. They were pretty nice guys at least it seemed that way during the phone interview. They asked me to walk through my resume first. (Just be confident with whatever you put on your resume.) At the end, you asked simple brain teaser. I failed the third round phone interview with a trader. I got stuck at one problem and that trader lost his patience on me.

    Interview Questions
    • estimate how many gallons of gas are consumed in US per week   View Answers (4)
    • suppose you live in middle town, your mom lives in downtown while your girl friend lives in uptown. You take subway to have dinner with either your mom or your girl friend every night. You always the first train that arrives at the station. why do you end up with have dinner with your girl friend 90% of the times? assume the uptown and downtown train run at the same intervals.   View Answers (5)
    • suppose you, player A, player B are in a tennis tournament. Player A has a better chance of beating you than player B does. If you would like to maximize your chance of winning two games in a row, which sequence would you prefer, ABA or BAB?   View Answers (4)
    • suppose you have a perfectly round disk. You put three legs randomly on this disk to form a table. Supposing the legs are perfectly perpendicular to the disk and are attached to the disk firmly, what is chance that the table will not fall when you flip the disk or in other word when you put the table to stand on its legs?   View Answers (19)
    No Offer
    Neutral Experience
    Difficult Interview
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  5.  

    Quant Interview

    Anonymous Interview Candidate in New York, NY
    Anonymous Interview Candidate in New York, NY
    Application Details

    The process took a dayinterviewed at Jane Street in September 2010.

    Interview Details

    I applied online. I was asked to be interviewed days later. The first questions are calculations such as 145x23. Later come 2 probability questions and two brainteasers. The interviewer is a male with no foreign accent. He sounds friendly and patient.

    Interview Questions
    • find a subset of {1,2,3,...,30} so that numbers in that subset is coprime to each other.   View Answers (5)
    No Offer
    Positive Experience
    Average Interview
  6.  

    Junior Quant Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    First step is to apply online with CV + Cover letter. After pre screening, you will be invited for a phone interview. Interview is mainly brain teaser/stats questions. Shouldn't be too hard to solve, just that you have to be really quick. They will help you out if you're not sure aobut the answers. Interview takes approximately 30 minutes.

    Interview Questions
    No Offer
  7.  

    Quant Trader Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    First there will be several telephone interviews. then if passed, they will invite you to their office and have face to face interviews, usually is the final round. Most questions are about math, probability and statistics, some like more to consulting cases. The questions of first round are all about mental maths.

    Interview Questions
    • Unexpected Question: Pls give a confidence correct probability of your answers. In what probability do you believe your answer is right?   View Answer
    No Offer
  8.  

    Quant Trader Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    A very nice HR but very difficult questions.

    Several mental maths problems. Then probability questions. If you were wrong, she'll keep asking you what's your probability of getting it right? If I let you bet on your answer on $1/100/1000/1m how's your answer?

    Interview Questions
    • Two teams A and B played football twice. Two independent matches. The average shoot of A in match 1 is greater than B. The average shoot of A in match 2 is also greater than B. So can we say the average shoot of A is greater than B in two matches together? If so, why? If not, give me an example. -------- Failed to give the example, but I believe that the statement is not right.   View Answers (2)
    No Offer
    Positive Experience
    Difficult Interview
  9.  

    Quant Interview

    Anonymous Interview Candidate in Hong Kong (Hong Kong)
    Anonymous Interview Candidate in Hong Kong (Hong Kong)
    Application Details

    I applied through college or university. The process took a dayinterviewed at Jane Street in January 2012.

    Interview Details

    Need to be analytic

    Interview Questions
    No Offer
    Neutral Experience
    Average Interview
  10. 1 person found this helpful  

    Quant Researcher Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Application Details

    The process took a weekinterviewed at Jane Street in November 2011.

    Interview Details

    Asked about my resume for a few minutes then straight in for the technical questions. Made it through the first one easy, struggled hard with the next one and they never phoned back. I feel unhappy as I don't feel this was a good assessment of my technical abilities.

    No Offer
    Negative Experience
    Difficult Interview
  11.  

    Quant Research Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Application Details

    The process took a dayinterviewed at Jane Street in November 2011.

    Interview Details

    applied through their webpage, got phone interview with software engineer,
    and they asked to log in to webpage designed to share codes. The interviewer was very nice, question was easy, but I was not well prepared.

    Interview Questions
    No Offer
    Neutral Experience
    Easy Interview

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