Jane Street Trading Intern Interview Questions

14 Interview Reviews

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Trading Intern Interview

Anonymous Interview Candidate
Anonymous Interview Candidate
Application Details

I applied online. The process took 4 weeksinterviewed at Jane Street.

Interview Details

I applied online through their website, which was fairly simple. They contacted me just a few days later looking to interview me, and from then on I exchanged short emails with an HR rep about good times for a phone interview.

Interview Questions
  • They always warm you up with an "easy" question or two. In my second interview, the warm up wasn't so easy. They first asked, "If I roll two dice and tell you that at least 1 is a 6, what is the probability that both are 6s?"   View Answer
  • Here is where the interview got difficult. The follow up question to the dice, "How much does the Earth weigh?" And then what is my 90% confidence interval.   View Answer
No Offer
Positive Experience
Difficult Interview

Other Interview Reviews for Jane Street

  1.  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Application Details

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

    Interview Details

    several rounds of half hour telephone interview

    Interview Questions
    No Offer
    Difficult Interview
  2.  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Application Details

    I applied through college or university – interviewed at Jane Street.

    Interview Details

    On Campus Interview, then Phone. There's a total of 5 rounds, with each round getting progressively harder. The questions themselves are interesting and certainly fun, but definitely take a good deal of thought if you haven't seen the questions before. They improvise a lot of questions on the spot, rather than sticking to a script.

    Interview Questions
    • "How many three pointers are made in the NBA per year?" "What's your 90% confidence interval on that?"   View Answer
    No Offer
    Positive Experience
    Difficult Interview
  3.  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Application Details

    I applied online. The process took 3 weeksinterviewed at Jane Street in February 2014.

    Interview Details

    Applied online. Contacted for interview the day after. Made it to round 2. Interview was quite difficult. Make sure to review probability and statistics for the interview. Don't bother studying behavioral questions. Most annoying thing was how Jane Street stopped replying after round 2, so I assume I didn't make past round 2.

    Interview Questions
    • The interviewer gives you 100 blank cards, and you can write a single positive integer on each card. The interviewer looks at the cards when you're done (so he knows the probability distribution of the deck), then shuffles the deck. The interviewer guesses the top card of the deck, and if he's right, he makes in $ the number written on the card. What numbers should you write on the cards to minimize the expected return of the interviewer?   View Answers (4)
    No Offer
    Positive Experience
    Difficult Interview
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  5.  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    Applied online, received an email within a week to schedule a phone interview, and the phone interview was a week later.

    Interview Questions
    • Three questions were mental math: 12,000,000 - 101; 24*24; 12% of 54.

      Then there was a probability question: you have 4 fair coins. If you flip all of them, what is the probability of getting at least 2 heads?
        View Answer
    No Offer
    Positive Experience
    Average Interview
  6.  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    Applied, same week got an interview

    No Offer
  7.  

    Trading Intern Interview

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

    I applied through an employee referral. The process took a weekinterviewed at Jane Street in November 2013.

    Interview Details

    Applied through a contact at the firm, was informed I got an interview about 6 hours later. We scheduled a phone interview for the following week. Pretty tough interview, wouldn't have been too bad if I was able to maintain my composure, got a little too nervous. Interviewer doesn't give his name or ask anything personal or fit based.

    Interview Questions
    • 11% of 68
      1,000,000-211
      32 x 28
      1 bowling ball has diameter of 8 inches, weighs 16 pounds. A bowling ball of equal density has diameter of 12. How much does it weight?

      We're going to play a game. You go first. You flip a coin and if you get H, I give you $30. If you get T, you give me the coin and I flip. If I get H, you give me $30, if I get T I give it back to you. We keep going until one of us gets heads. What is the max amount you'd be willing to pay to go first. Give a 50% confidence range and a 90% one of your answer. Why?
        View Answers (3)
    No Offer
    Positive Experience
    Difficult Interview
  8. 1 person found this helpful  

    Trading Intern Interview

    Anonymous Interview Candidate
    Anonymous Interview Candidate
    Interview Details

    One email and then a phone screen. The phone call lasted only 15 minutes long and was very difficult, consisitng of very quick math questions and then a longer question about combinatorices. The interviewer seemed disinterested but probably because he had to take time from his busy day to interview.

    Interview Questions
    • Typical dice question with variations and the expected value of rolling the dice a couple times. Price for playing the game of throwing dice.   Answer Question
    No Offer
  9.  

    Trading Intern Interview

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

    I applied through a recruiter. The process took 3 weeksinterviewed at Jane Street in October 2012.

    Interview Details

    Few rounds of interviews

    Interview Questions
    • No “unexpected” question types. 1 fit “describe your experience at college” question at most. Everything else was math and probability in first round.   Answer Question
    No Offer
    Negative Experience
    Difficult Interview
  10.  

    Trading Intern 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 February 2012.

    Interview Details

    There was no behavioral section to the interview. I was asked a few probability dice questions and a card game question. There was also a mental math problem at the beginning.

    Interview Questions
    No Offer
    Positive Experience
    Difficult Interview

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