The process took 2 months. I interviewed at Jane Street (London, England) in Nov 2024
Interview
3 stages of online interviews, getting progressively harder. Mostly focused on brain teasers, with a couple questions on CV in 3rd interview. Apparently 4th round is in person and consists of 4 interviews across the day but I didnt reach that point.
Interview questions [3]
Question 1
If copying, pasting and typing a letter each take one second, what is the fastest way to reach atleast 200 letters written?
You roll a 4 sided die and sequentially add up the score seen. What is the expected value of the first number you see above 100. Follow up: what if we start at 96 instead of 0
You and an opponent are each given a number between 0 and 1 uniformly, and the higher number wins 1 point from the other. Having seen your number and not your opponents, you can choose offer double the odds or just continue to see their number. If you offer double, the opponent can, having seen their number either reject the offer (losing 1) or play double, potentially losing or winning 2 based on the numbers. How should you play?
Went through 3 rounds of interview, all of which were focused on math. they started with basic questions and built up to harder ones. Also some behavioral questioins at the start of each round
Applied online and passed the resume screen, got invited to a first round, didn't pass, was my first time interviewing for quant and nerves made me answer not quite at the best of my ability
Interview questions [1]
Question 1
In a game you are given a distribution of marbles, how to figure out the maximum payoff without knowing the colors
I was qualified for the first round of the interview proccess. I was asked about the reasons why i want to become a Quant and why i applied in Jane street for this role. After I was asked two probability questions. The interviewer was ok but at some moments I wasn't sure if she was following my thoughts
Interview questions [1]
Question 1
Mainly I failied since I tried to give them a strict answer to one of the problems(which was impossible to calculate in this time) and the wanted to hear some intuitive approach which leads to approximately correct answer.