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Jane Street Interview Questions
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 29 quant interview questions of the kind asked at Jane Street, spanning Brain Teasers, Probability, Stochastic Processes, Calculus & Linear Algebra, Algorithms & Numerical, Options & Greeks, Portfolio & Risk. Each comes with a full worked solution — sign in to check your answers and track your progress.
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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
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
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
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
Kelly Criterion
Portfolio & RiskCitadelJane Street
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