Jane Street Quantitative Analyst Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 182 interview experiences · FREE TO READ
Candidate interview experiences
First-hand accounts from people who interviewed at Jane Street.
Jane Street
Quantitative Researcher
Mid Average Negative experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite Offer
Interview formats
Technical Behavioral
The interview process involved a Zoom call followed by onsite meetings. The interviewers were generally friendly, though one individual from the equity quant research team seemed arrogant and possibly lacked basic vocabulary. There were some last-minute reschedules without notifications before the onsite interviews.
Confirmed questions1 question
- What are some usual questions within your field?
Jane Street
Quantitative Researcher
Intern Average Positive experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite
Interview formats
Technical Coding Other
The quantitative researcher internship interview process at Jane Street is pretty intense. You'll definitely need to know your stuff when it comes to probability, mental math, game theory, and logic puzzles. They really want to see how well you can solve problems, explain your thinking clearly, and stay quick under pressure, usually through several tough rounds that involve math, probability, coding, and games.
Confirmed questions1 question
- Alice and Bob are flipping coins until they get heads. Given that Bob flipped his coin more times than Alice, what's the expected number of flips Alice made?
Jane Street
Quantitative Researcher
Mid Difficult Positive experience No offer 4 rounds
Interview process
Recruiter call Technical screen Take home Technical screen Onsite
Interview formats
Technical Coding Technical Technical Technical Presentation
The interview process involved four rounds. The first three were online, and the last one was onsite. Kicked off with brain teasers and probability questions. Then a coding test that wasn't too tough. The third round got into more challenging maths and probability problems. My onsite interview had two parts in the morning: one focused on maths and machine learning, and the other was a 'data round' where I had to look at a dataset and discuss how to train a model with the interviewer. I think I did alright. They sent me home after lunch though :(
Confirmed questions1 question
- Regarding a dice game where you can stop and take the face-up value or continue, with a maximum of three rolls, what would be the expected gain?
Jane Street Quantitative Analyst Interview Questions
Quoted word for word from Jane Street interview reports.
“What is the probability P(n) that n points picked independently and uniformly at random on the circumference of a circle all lie within some semicircle of the circle, and what is its closed-form in terms of n?”
Read reports →“A robot's daily routine has four equally likely (1/4 probability) outcomes each morning: 1) it self-destructs; 2) it does nothing; 3) it clones itself, resulting in 2 robots; or 4) it clones itself twice, resulting in 3 robots. Starting with one robot on day one, what is the probability that eventually, there will be no robots left?”
Read reports →“Given a solar system with three planets having orbital periods of 60, 84, and 140 years respectively, and assuming they are currently aligned with the sun, determine the next instance when all three planets will again be aligned with the sun.”
Read reports →“Given two decks of cards, one 52-card (26 red, 26 black) and one 26-card (13 red, 13 black), you draw two cards from each. You win if both cards are the same color. Which deck gives you a better chance of winning?”
Read reports →“Basic probability and combinatorics question: If a bear aims to catch 3 fish and leaves after that, with a 50% chance of catching any fish that appears, what's the probability the 5th fish isn't caught?”
Read report →“Given three random variables X, Y, and Z, where the correlation between X and Y is 0.9, and the correlation between Y and Z is 0.8, determine the minimum and maximum possible correlation between X and Z.”
Read report →“Suppose you toss two dice. If the sum comes up as 7, you win $1. If the sum is an even number, you lose $1. If neither of those happens, you roll again. What's the expected payoff?”
Read report →“In an urn, red and blue balls are in equal number. You draw 3 balls. What's the probability the number of balls you extracted is odd? Then, what's the probability if you extract 10 balls?”
Read report →“Given a standard 52-card deck, cards are drawn one by one and placed face-up. At any point, you can name a color. If the next two cards drawn are of that color, you win; otherwise, you lose. What's the best strategy?”
Read report →Formats, difficulty and experience
Across all 182 Jane Street interview reports.