Jane Street Trader Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 348 interview experiences · FREE TO READ
Candidate interview experiences
First-hand accounts from people who interviewed at Jane Street.
Jane Street
Trader
Entry Difficult Positive experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite
Interview formats
Technical Behavioral
The interview process involved some probability questions that were pretty open-ended, focusing on how I approach problems and do calculations. They allowed pen and paper but no calculators. There wasn't an OA, but there were a few rounds. I eventually got rejected after a Zoom call with a trader.
Confirmed questions3 questions
- How would you approach probability questions?
- Can you explain your thought process and calculations for probability problems?
- What is your understanding of standard probability and expected value?
Jane Street
Trader
Mid Difficult Neutral experience No offer 5 rounds
Interview process
Recruiter call Phone screen Phone screen Phone screen Onsite
Interview formats
Technical Technical Technical Technical Technical Coding
First there was an HR CV screen, then three phone interviews that got harder each time, covering stuff like EV game theory. It finished with an on-site that included market making, data analysis, games, and coding rounds. I didn't make it past the third round though.
Confirmed questions3 questions
- Questions about dice games with concepts of EV and game theory.
- What's the probability of rolling an even number of heads?
- Basic questions on coin probability.
Jane Street
Trader
Intern Average Positive experience No offer 1 round
Interview process
Recruiter call Phone screen
Interview formats
Technical Coding Behavioral
I applied online and then had one round phone interview with a trader. It lasted for an hour and the interviewer was nice and smart. Overall, the process was good.
Confirmed questions3 questions
- Given four coins, you receive coins equal to the number of heads up. How much would you pay for this?
- If you were allowed to flip over two coins, how many would you pay?
- If you could flip over two coins an infinite number of times, what would you pay?
Jane Street Trader Interview Questions
Quoted word for word from Jane Street interview reports.
“After dipping a cube in paint and then cutting it into 27 smaller cubes which are then placed in a bag, what's the probability that a randomly selected sub-cube, when rolled on a table, shows no paint?”
Read reports →“What is the probability that the last passenger sits in their assigned seat, given 100 seats on a full train, a blind first passenger who picks randomly, and subsequent passengers picking randomly if their assigned seat is taken?”
Read reports →“Can you determine the sum of the digits for all integers spanning from 1 to 1,000,000? Note this is different from summing the numbers themselves; for example, the sum of numbers 1 to 10 is 55, but the sum of their digits is 46.”
Read reports →“Given a 3x3x3 cube painted red, which is then divided into 27 smaller cubes, if one small cube is picked randomly and tossed, what is the probability that at least one of its visible sides has paint on it?”
Read reports →“Given a 3x3 block with its surface painted, which is then split into 27 smaller cubes and one cube is dropped, what's the probability that none of its visible faces are painted, and if that's the case, what's the probability it's the center cube?”
Read report →“A bus starts with some passengers and makes 3 stops. At each stop, two-thirds of the passengers alight, and 7 new passengers board. What's the smallest possible number of passengers the bus could have had initially?”
Read report →“For a car with a value uniformly distributed between 0 and 1000, what is the optimal bid if bidding less than the value means you keep your bid, and bidding more means you can sell it for 1.5 times its value?”
Read report →“A king has 1000 bottles of wine, and one is poisoned. The poison's effects appear after one month, and it's fatal even when diluted 1,000,000 times. The king wants to identify the poisoned bottle using prisoners and ensure he can still drink the wine within 5 weeks. What's the minimum number of prisoners he needs to use?”
Read report →“You have 4 coins and can get paid based on the number of heads from a flip. You have the option to flip again once if you're unhappy with the first result, but you must take the second outcome. What is the expected value of this game?”
Read report →Formats, difficulty and experience
Across all 348 Jane Street interview reports.