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      Jane Street

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      Summer Internship London Interview

      Jan 5, 2014
      Anonymous Interview Candidate
      London, England
      No offer
      Positive experience
      Difficult interview

      Application

      I applied online. The process took 3 weeks. I interviewed at Jane Street (London, England) in Dec 2013

      Interview

      Applied online, received an answer 3 weeks later for a phone interview. 1st interview was ok because I had a lot of preparation and the questions were the same kind of those you can find on glassdoor or "heard from the street" (ex: you can roll a dice up to three time, was is your playing strategy ? ans: you should stop playing if you get a 5 or 6 for the first roll, 4, 5 or 6 for the second roll). Also mental math like 79*81 (do (80-1)*(80+1)) or 13% of 34 or what is 1/7 ? The second interview was the same kind but with more difficult questions. I didn't passed this round. Good experience and nice interviewer the first time. Less friendly the second time.

      Interview questions [1]

      Question 1

      First interview: Your uncle have a car. The VALUE of this car is uniformly distributed between 0 and 1000. You have to choose a PRICE for this car. If this price is equal or greater than the VALUE of the car, you will be allowed to buy the car for this PRICE and I will buy you back this car for 1,5 its VALUE. If your PRICE is lower than its VALUE, your uncle keep his car. What do you do ? Second interview: What is the next date (DD/MM/YYYY) when all the numbers will be different ?
      1 Answer