Jane Street Quant Trading Intern Interview Questions | Glassdoor
Difficult interview
Application
I applied online. I interviewed at Jane Street
Interview
Jane Street quant trading interviews test probability, logic, mental math, and clear reasoning. They value collaboration, adaptability, humility, and communication. Expect puzzles, expected value problems, and scenario reasoning—not prior finance knowledge.
Interview questions [1]
Question 1
You play a 100-round game: each round you can either roll a fair 20-sided die (uniform 1 to 20) or “lock in” the current face and collect that same reward for all remaining rounds. You must roll in the first round. What is your optimal stopping / locking strategy and expected value?
The interview was very disappointing. This was my 3rd round with the firm, the interviewer barely cared about my solutoin, was yawning, disinterested for some reason. So, yeah it was a pretty bad experience and no!! I was not doing stupid stuff in the interview it was just a bad day i believe. The question that they asked was about 10 cards on a deck and by the end they were able to make it a multiplayer game where you had to think of a winning strategy with x red and 10-x blue cards.
Interview questions [1]
Question 1
The question that they asked was about 10 cards on a deck and by the end they were able to make it a multiplayer game where you had to think of a winning strategy with x red and 10-x blue cards.
They asked mostly probability and game theory questions. On-site consisted of a lot of betting games. Very collaborative experience when working on through questions. Overall I enjoyed the the interview experience.
Interview questions [1]
Question 1
First question was on dice rolling, you get one dollar if your roll is higher than your opponent then you win nothing otherwise.
Final round consisted of five rounds in person. Standard market making game on sum of 4 cards with side bet for arbitrage (40 card deck), then one coding (simple, not leetcode esque), then one data analysis, and two more math/trading esque games
Interview questions [1]
Question 1
For side bets, you can do on next card being red/black or higher/lower than 5.5 for 1:1 payout. (you need to figure out how to use this for arb)