Jane Street Interview Guide
Jane Street runs three stages built on games played out loud, and by the final round that becomes literal: you bet 100 poker chips on your own answers.
Application and resume review
Resume only, no cover letter
What to expect
- You apply at janestreet.com with a resume. No cover letter is required.
- One application covers multiple roles and offices, so you do not apply to each separately.
- Most candidates hear back within about a week.
- The process assumes no finance background and no complicated math.
How to prepare
- Apply as early in the cycle as you can.
- Lead the resume with quantitative coursework, competition results and any research work.
Phone rounds
Pen and paper allowed; no calculators or computers
What to expect
- Two or three conversational calls, with one or two interviewers.
- Built around betting and strategy games rather than a timed test.
- Early questions sit on basic problem solving, probability, Bayes and expected value.
- The interviewer poses a problem, twists it, then generalizes it, with your answer carried forward.
- Interviewers score the reasoning, so work out loud.
How to prepare
- Solve Bayes and conditional expectation problems on paper and out loud, the medium of the call.
- Rehearse betting games where the interviewer keeps adding rules mid-problem.
- Follow Jane Street’s own tips: work methodically, communicate clearly, correct mistakes, ask why.
Final round
100 poker chips, bet across the day
What to expect
- Four to six back-to-back sessions of about an hour, in the office or over Zoom.
- Traders run most of it, plus an HR conversation on motivation, background and fit.
- You are handed 100 poker chips at the start and bet them on scenarios and on your own answers.
- You are asked for a confidence interval: a range you believe contains the answer, at 99%, then 95% and 90%.
- Calibration is what is scored: a 90% range should contain the answer about nine times in ten.
- Market making on your own answer, fast, at a stated risk per point.
- A 20-sided die game where a new rule is added each round: take the face value, or pay to re-roll.
- Pen and paper are allowed. Calculators and computers are not.
How to prepare
- Play the chip format against a clock so betting your own confidence is already rehearsed.
- Quote 90%, 95% and 99% intervals on questions you cannot answer, then check how often you are inside.
- Practice the take-or-re-roll decision until you can price it while the rules keep changing.
FAQ
How many interview rounds does Jane Street have?
Three stages. A resume review that a person actually reads, then two or three phone rounds of 45 to 60 minutes built around betting and strategy games, then a full-day final round of four to six back-to-back sessions with traders plus an HR conversation.
What is the Jane Street chip game?
At the final round you are handed 100 poker chips at the start of the day and bet them across the sessions on scenarios and on your own answers. Alongside the chips you are asked for ranges you believe contain the answer, at 99%, then 95%, then 90%. What is scored there is calibration: whether a 90% range really does contain the answer about nine times in ten, and whether your tighter ranges sit inside your wider ones.
Does Jane Street test mental math speed?
Not as the filter. Jane Street’s own materials and candidate accounts both emphasise reasoning over speed, and the interviews assume no finance background and no complicated math. Arithmetic still shows up inside the games, and slow arithmetic costs you time you need for the reasoning, but speed drills are not what the loop selects on.
What can you bring to a Jane Street interview?
Pen and paper. Calculators and computers are not allowed, in the phone rounds or on the final-round day, which is why candidates are told to practise problems on paper and out loud rather than in a spreadsheet.