Quant Trading Internship applicants have rated the interview process at Jane Street with 4 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
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I applied online. The process took 1+ week. I interviewed at Jane Street (Hong Kong) in Apr 2022
Interview
Fill in the initial application then you get an email from HR to set up phone interviews with traders. Phone interviews involved questions involving probability and expected value. Only passed to second round of phone interview, but there are supposedly up to four rounds of phone interview.
Interview questions [1]
Question 1
Q: you have four coins, what is the chance of getting an odd number of heads?
I applied online. The process took 2 weeks. I interviewed at Jane Street (London, England) in Sep 2024
Interview
1st interview: basic probability brainteasers
2nd interview: significantly more difficult game questions one involving dice and other coins. Two players roll a dice then decide whether they pick their own, other, or withhold decision until next round. What's the optimal strategy?
Interview questions [1]
Question 1
You are playing a game where you flip a coin 5 times. You win if three heads come up in the 5 coin tosses. You lose if three tails come up in the 5 coin tosses. If you win you get £1. If you lose you lose £1. Before each flip you can choose to either double the stakes from their previous value (if you win you get £2n and if you lose you lose £2n where n is the amount you get if you win beforehand) or keep them the same. Are you willing to pay £0.50 to play this game?
Flipping coins, betting on sums, products, other interesting contracts. Some amount of being smart about formulating a market making strategy. Finally, some game theory (nash equilibrium) and excel tasks. Overall very thorough and comprehensive.
I applied online. I interviewed at Jane Street (Hong Kong) in Jun 2023
Interview
They asked entirely maths/probability questions, usually with some sort of coin toss/die roll element in the context of a game. Very friendly and patient interviewers, who will guide you through the questions.
Interview questions [1]
Question 1
We are playing a game where we roll two die. If the sum is even, you win and the game ends. If the sum is 7, I win and the game ends. If the sum is odd, we roll again. What is the probability that you win?