Jane Street Online Assessment
Jane Street's screen is built around probability, expected value, and mental math, not algorithmic coding. The first-round assessment is a short set of brain-teasers where your reasoning matters as much as the number; a separate quant-research round adds a live coding exercise, and trading-operations roles get an Excel-based task.
Trading & Research — Trader / QT / Research
A short, timed set of probability, expected-value, and mental-math questions (prime-sum parity, an optional-reroll dice game, a Bayesian coin re-flip, a two-urn posterior bet, plus counting and estimation). You explain your reasoning, not just the answer.
Trading & Research — Quant Research coding round
A second-round live coding exercise for quant-research candidates - a clean implementation problem (not LeetCode trickery), with follow-ups on efficiency and on shaping the code into a reusable library.
- Gravity Grid k-in-a-Row Coding · hard
Jane Street OA — FAQ
What is the Jane Street online assessment?
Jane Street's screen is built around probability, expected value, and mental math, not algorithmic coding. The first-round assessment is a short set of brain-teasers where your reasoning matters as much as the number; a separate quant-research round adds a live coding exercise, and trading-operations roles get an Excel-based task.
What is the format of the Jane Street OA?
It runs as 2 tracks (Trader / QT / Research, Quant Research coding round). Trading & Research, Trading & Research — each timed, auto-graded where applicable.
How do I practice for the Jane Street online assessment?
Work the sample questions above (each with a full worked solution), then take the interactive Jane Street OA practice on QuantVault. For the full interview, see the Jane Street interview-questions set.