Jane Street interviews are uniquely challenging, focusing on probability, mental math, trading intuition, and OCaml/functional programming. They test your ability to think under uncertainty, reason about edge cases, and communicate mathematical ideas clearly.
Use this guide as an execution checklist: align your prep to each round, rehearse examples for behavioral depth, and run timed technical sessions to validate speed and clarity. Most candidates improve faster when they combine targeted study with regular simulation rather than solving questions at random.
Math puzzles, probability questions, and market-making scenarios.
Two interviews: coding in OCaml + quantitative reasoning.
Multiple rounds: coding, systems, trading games, and behavioral.
Mock trading game testing decision-making under uncertainty.
Probability, expected value, combinatorics, estimation
Functional programming (OCaml), algorithms, correctness
Market-making games, risk assessment, pricing
Collaboration, communication under pressure
These coding patterns appear frequently in Jane Street interviews.
Cross-training on adjacent company loops improves adaptation. These guides cover similar coding, system design, and behavioral expectations.
We have questions tagged from real Jane Street interviews. Practice with FSRS spaced repetition to ensure you remember patterns when it counts.
Pair this guide with topic practice and timed simulation so you can move from knowledge to interview execution.
Keep a short weekly retrospective with three notes: what improved, what stalled, and what you will change next week. That feedback loop makes company-specific prep more consistent and reduces last-minute cramming.