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Jane Street Interview Questions
Problems
42
Topics
9
Hard
14
Jane Street is a proprietary trading firm known for ETF and options market-making and a famously probability- and mental-math-heavy interview process. Below are 42 quant interview questions of the kind asked at Jane Street, spanning Brain Teasers, Probability, Stochastic Processes, Calculus & Linear Algebra, Algorithms & Numerical, Options & Greeks, Market Making & Games, Portfolio & Risk, Statistics. Each comes with a full worked solution — sign in to check your answers and track your progress.
Brain Teasers 8Probability 9Stochastic Processes 5Calculus & Linear Algebra 4Algorithms & Numerical 7Market Making & Games 6
Preparing for Jane Street? Read the guide: Jane Street Interview Questions: What They Ask and How to Prepare
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Screwy Pirates
Brain TeasersJane StreetOptiver
Sum 1 to 100
Brain TeasersJane StreetGoldman Sachs
Poisoned Wine
Brain TeasersGoogleJane Street
Mislabeled Jars
Brain TeasersJane StreetOptiver
12 Balls, One Odd
Brain TeasersCitadelJane StreetTwo Sigma
Bridge Crossing
Brain TeasersGoogleJane Street
The Camel and the Bananas
Brain TeasersJane StreetGoogle
The Blue-Eyed Islanders
Brain TeasersJane StreetTwo Sigma
Coin Toss — Two Heads
ProbabilityJane Street
Drunk Passenger
ProbabilityJane StreetCitadel
Broken Stick Triangle
ProbabilityJane StreetCitadel
Hat Check
ProbabilityJane StreetDE Shaw
Russian Roulette — Spin?
ProbabilityJane StreetCitadel
Expected Max of Two Uniforms
ProbabilityJane StreetCitadel
The Tuesday Boy
ProbabilityJane StreetSIG / Susquehanna
The 100 Prisoners Problem
ProbabilityJane StreetTwo Sigma
The Secretary Problem
ProbabilityJane StreetDE Shaw
Flips Until Two Heads in a Row
Stochastic ProcessesJane StreetCitadel
Gambler’s Ruin
Stochastic ProcessesJane StreetSIG / Susquehanna
Expected Flips for HTH
Stochastic ProcessesJane StreetSIG / Susquehanna
Random Walk — Expected Steps
Stochastic ProcessesJane StreetTwo Sigma
The Ballot Problem
Stochastic ProcessesJane StreetDE Shaw
Derivative of xˣ
Calculus & Linear AlgebraJane StreetCitadel
Maximize x^(1/x)
Calculus & Linear AlgebraJane StreetSIG / Susquehanna
Sum of First 10 Squares
Calculus & Linear AlgebraJane StreetTwo Sigma
Approximate cos(0.1)
Calculus & Linear AlgebraJane StreetOptiver
Trapping Rain WaterLeetCode
Algorithms & NumericalJane StreetCitadel Securities
Newton’s Method for √2
Algorithms & NumericalGoldman SachsJane Street
Rand10() from Rand7()LeetCode
Algorithms & NumericalJane StreetOptiver
Best Time to Buy and Sell Stock IILeetCode
Algorithms & NumericalOptiverJane Street
Gas StationLeetCode
Algorithms & NumericalJane StreetCitadel
Nim GameLeetCode
Algorithms & NumericalJane StreetSIG / Susquehanna
Predict the WinnerLeetCode
Algorithms & NumericalJane StreetOptiver
How Dear Can a Call Be?
Options & GreeksJane StreetAkuna Capital
Roll, Keep or Re-roll
Market Making & GamesJane StreetSIG / Susquehanna
The Red–Black Card Game
Market Making & GamesJane StreetCitadel Securities
Two-Thirds of the Average
Market Making & GamesJane StreetOptiver
Shading a First-Price Bid
Market Making & GamesJane StreetDE Shaw
The St. Petersburg Game
Market Making & GamesJane StreetTwo Sigma
The Two-Envelope Paradox
Market Making & GamesJane Street
Kelly Criterion
Portfolio & RiskCitadelJane Street
Correlation of X with X + Y
StatisticsJane StreetCitadel
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