Practice 1200+ real quant interview questions from Jane Street, Citadel, Optiver, and 13 top firms. Mental math drills, probability practice, and AI mock interviews that feel real.
The exact problem types asked at Jane Street, Optiver, and Citadel.
You flip a fair coin repeatedly until you get two heads in a row. What is the expected number of flips?
Every question comes from 2024–2025 recruiting cycles. Sourced from candidates who interviewed at Jane Street, Citadel, Optiver, Two Sigma, and 12 more firms. Filter by firm, topic, or difficulty and track what you've solved.
Browse QuestionsAlex is an AI voice interviewer trained on real Jane Street questions. You speak your answers out loud, and Alex follows up like a real interviewer. Three questions per session, around 30 minutes. Practice the verbal interview format.
Start InterviewWe find all the quant jobs for you. Jane Street, Citadel, Optiver, DRW, SIG, and 11 more top firms. Apply with one click, then track every application.
View Open RolesEvery major topic tested at Jane Street, Citadel, Optiver, and top HFT firms.
Expected value, combinatorics, distributions
Logic puzzles and lateral thinking
Speed arithmetic for firm OAs
Hypothesis testing, regression, distributions
Core quant interview concept
Brownian motion and Itô's lemma
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Optiver Offer
Join 10,000+ candidates who got offers at top quant firms. Practice real interview questions, improve mental math with zetamac-style speed drills, and get interview experience with AI coaching.
