Jane Street Interview Questions
Real, sourced Jane Street interview questions across 3 roles — 29 questions total, each with a structured answer outline. Updated for the 2026 hiring cycle from public interview reports.
Quantitative Research (New Grad)
10 questionsJane Street's new-grad quant research loop in 2026 is a coding test, a phone interview, and a multi-round virtual onsite covering probability, mental math, brainteasers, and trading-game mechanics. The bar on math intuition under time pressure is the dominant signal — interviewers care less about whether you remember a specific identity and more about how you reason out loud.
Quantitative Trader (Intern)
9 questionsJane Street's quant intern loop in 2026 mirrors the full-time loop with slightly shorter onsite: probability, mental math, market-making games, and a behavioral round. The internship is the firm's primary new-grad pipeline; conversion rates are high for strong performers. Loops in 2026 are predominantly virtual with optional in-person final at NY.
Software Engineer (New Grad)
10 questionsJane Street's new-grad SWE loop in 2026 is one of the most distinctive in the industry: OCaml exposure preferred (though not strictly required), heavy emphasis on functional programming concepts, and rigorous low-level systems questions. Engineers and traders share the office and many interview rounds; expect probability and brainteasers even on the engineering track.