Jane Street.
Jane Street is known for its probability puzzles, mental math, and deeply analytical interviews that are considered among the most challenging in finance.
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Everything you need to know before your Jane Street interview.
To prepare for a Jane Street interview, research the company thoroughly, practice role specific questions using the STAR method, and prepare thoughtful questions to ask your interviewer. Orbyt's free Jane Street interview guide provides 6 questions to expect and 4 smart questions to ask, composed by Orbyt for finance interviews rather than taken from any company question bank, plus a free AI tool that generates questions tailored to your specific role in seconds.
The Jane Street interview process.
Jane Street's process includes a phone screen with math and probability puzzles, followed by a full day of interviews with five to six sessions covering probability, market making scenarios, programming (OCaml), and collaborative problem solving. The process takes four to eight weeks. Expect trading simulation games.
What Jane Street looks for.
Jane Street seeks sharp quantitative minds who think probabilistically, communicate precisely, and enjoy collaborative problem solving. They value intellectual curiosity, comfort with uncertainty, and the ability to update beliefs based on new information. Functional programming (OCaml) skill is valued for tech roles.
Jane Street interview questions to expect.
These are the kinds of questions candidates commonly face in Jane Street and similar interviews. Prepare a specific story for each, ideally with the STAR method.
Tell me about a decision you made with incomplete information.
Describe a time you managed competing priorities with hard deadlines.
Why Jane Street, and why this part of the industry?
Describe a time you caught an error others missed.
What does managing risk responsibly mean to you?
Describe a time you delivered difficult news to a client or manager.
Smart questions to ask in your Jane Street interview.
Asking thoughtful questions shows genuine interest and helps you decide if Jane Street is the right fit for you.
What does the growth path look like from this role?
How does the team stay ahead of regulatory change?
What is the biggest change Jane Street is navigating in the market right now?
What separates a good performer from a great one on this team?
How to prepare.
Practice probability puzzles, mental math, and expected value calculations daily for weeks before the interview.
Study market making fundamentals: bid ask spreads, inventory management, and information asymmetry.
Prepare for mock trading games where you buy and sell based on incomplete information.
Learn about Jane Street's OCaml based technology stack if applying for engineering roles.
Common mistakes.
Not practicing mental math and probability enough; Jane Street expects rapid, accurate mental calculations.
Being uncomfortable with uncertainty; Jane Street values thinking in probabilities rather than certainties.
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