Guides & explainers

Study guides & book companions

• The Best Quant Interview Books, Compared (2026)

  Honest 2026 comparison of the best quant interview books: Green Book vs Heard on the Street vs Joshi, plus probability picks. Which to read for which role.

• Blitzstein's Introduction to Probability: The Best Foundation for Quant Prep

  Harvard's Stat 110 book for quant prep: why it's the best probability foundation, the chapters that map to interviews, and how to pair it with problem drilling.

• Fifty Challenging Problems in Probability: A Quant Prep Guide

  How to use Mosteller's Fifty Challenging Problems in Probability for quant interview prep: which problems still get asked, how to work the solutions, and where to practice the same ideas interactively.

• Green Book Solutions & Study Guide

  Solutions-focused study guide to Xinfeng Zhou's Green Book: what each chapter covers, how to work the solutions properly, and where to drill the same topics with free step-by-step practice.

• Heard on the Street: Solutions & Study Guide

  A study guide to Timothy Crack's Heard on the Street: what it covers, how to work through the solutions, whether you need the PDF, and how to drill the same topics with free interactive practice.

• Mark Joshi's "Quant Job Interview Questions and Answers": Who It's For and How to Use It

  How to use Mark Joshi's "Quant Job Interview Questions and Answers" for quant dev and desk-quant prep, plus where to practice the coding and pricing problems.

• Puzzles to Puzzle You: A Quant Prep Guide

  Shakuntala Devi's Puzzles to Puzzle You for quant interviews: what transfers, what doesn't, and where to practice the same puzzle families with solutions.

• The "Quant Interview Questions PDF" — What You're Actually Looking For

  Looking for a quant interview questions PDF? What the circulating PDFs actually contain, what they miss, and where to get the same material free with worked solutions.

• Shreve for Quant Interviews: What You Actually Need

  Shreve Volume I & II for quant interviews: which chapters matter, what interviewers actually ask from them, and how to pair the books with practice.

How QuantVault compares to other prep tools

• The Best Quant Interview Prep, Honestly Compared (2026)

  An honest 2026 guide to the best quant interview prep: Zetamac, Brainstellar, QuantQuestions, QuantVault, getcracked, and the books, mapped to each stage.

• QuantGuide Alternatives, Honestly Ranked

  The real QuantGuide alternatives compared: QuantVault, Brainstellar, Zetamac, the Green Book, LeetCode, TraderMath and more — what each is for and what it costs.

• QuantVault vs Brainstellar: An Honest Comparison

  Brainstellar's free puzzle collection vs QuantVault's structured quant prep: solution depth, firm mapping, OA practice, and how to use each for quant interviews.

• QuantVault vs getcracked: An Honest Comparison

  Honest comparison of QuantVault vs getcracked.io for quant interview prep: community and fresh intel vs. a structured practice bank, funnels, and a coding judge

• LeetCode for Quant Interviews: What It Covers, What It Misses

  Is LeetCode enough for quant interviews? What quant loops actually test, where LeetCode fits for QR/QD/trading roles, and what to use for the probability and market rounds.

• QuantVault vs OpenQuant: An Honest Comparison

  QuantVault vs OpenQuant compared: OpenQuant's quant job board and prep resources vs QuantVault's firm funnels, 2,800+ problem bank, OA simulations, and trading games.

• QuantVault vs QuantGuide: An Honest Comparison

  QuantVault vs QuantGuide compared honestly: question banks, solutions depth, firm-specific prep, OA practice, trading games, and pricing — and which fits your prep.

• QuantVault vs QuantQuestions: An Honest Comparison

  An honest QuantVault vs QuantQuestions comparison: two quant-interview question banks compared by problem count, firm playlists, coding judge, and use case.

• QuantVault vs TraderMath: An Honest Comparison

  An honest QuantVault vs TraderMath comparison: where each tool wins, a feature table, and how to pick the right quant interview prep for your use case.

• QuantVault vs Zetamac: An Honest Comparison

  Zetamac trains raw arithmetic speed; QuantVault covers the whole quant interview. What each is for, how trading firms actually test mental math, and how to combine them.

Concept & question-type explainers

• Bayes' Theorem in Quant Interviews

  Bayes for quant interviews: the odds-form update that traders use, false-positive classics, witness problems, and practice problems with full solutions.

• Coin Flip Questions in Quant Interviews

  Coin-flip questions for quant interviews: pattern races (HH vs HT), waiting times, biased-coin tricks, fair-from-unfair, and practice problems with solutions.

• Dice Questions in Quant Interviews

  Dice questions for quant interviews: expected values with rerolls, dice games and fair pricing, non-transitive dice, and practice problems with full solutions.

• Gambler's Ruin in Quant Interviews

  Gambler's ruin for quant interviews: fair and biased formulas, a worked example, the random-walk connection, and practice problems with full solutions.

• The Kelly Criterion in Quant Interviews

  The Kelly criterion explained for quant interviews: the formula, a worked example, why trading firms ask it, fractional Kelly, and practice problems with solutions.

• Markov Chains in Quant Interviews

  Markov chains for quant interviews: transition matrices, stationary distributions, absorbing states, a worked example, and practice problems with full solutions.

• Martingales in Quant Interviews

  Martingales for quant interviews: the definition that matters, optional stopping in practice, the ABRACADABRA theorem, the betting-system fallacy, and practice problems.

• The Monty Hall Problem — and the Variants Interviews Actually Ask

  Monty Hall for quant interviews: why switching wins, the 100-door and n-door variants, the ignorant-host twist, and practice problems with full solutions.

• Optimal Stopping in Quant Interviews

  Optimal stopping for quant interviews: the 37% secretary rule, backward induction, threshold strategies, dice and uniform variants, with practice problems and solutions.

• Random Walks in Quant Interviews

  Random walks for quant interviews: recurrence, hitting probabilities, expected exit times, reflection principle, and practice problems with full solutions.

Firm interview intel

• The Da Vinci Derivatives Interview, Explained

  Da Vinci Derivatives' famously games-heavy trading assessment as candidates report it: math test, poker-style games, market making — and how to prepare.

• The G-Research Quiz, Explained

  G-Research's famous quant quiz explained: the timed math/probability format candidates report, what it filters for, and how to practice for it.

• Jane Street Puzzles vs the Jane Street Interview

  Jane Street's monthly puzzles vs their actual interview: what the puzzles train, what the interview actually asks, and how to prepare for each.

• The Maven Securities Interview, Explained

  Maven Securities' trading interview process as candidates report it: math test, games, and interviews — plus how to prepare for each stage.

• The Quadrature Capital Interview, Explained

  Quadrature Capital's interview process as candidates report it: research-style problems, ML/statistics depth, and coding — plus a preparation plan.

Careers in quant

• Quant Firms by Interview Difficulty

  Which quant interviews are hardest? A candidate-reported difficulty tiering across HFTs, prop shops, and funds — and what makes each tier hard in a different way.

• The Quant Internship Timeline for Summer 2027

  The 2027 quant internship recruiting timeline: when applications open, how early the elite firms close, stage-by-stage pacing, and a month-by-month prep plan.

• Becoming a Quant Without a PhD

  You don't need a PhD for most quant seats. Which roles require one, which don't, and the concrete no-PhD paths through trading, dev, and research.

• Quant Salaries in 2026: The Honest Numbers

  Quant compensation in 2026: new-grad and senior ranges for quant traders, researchers, and developers by firm tier, plus internship pay and how offers are structured.

• Quant Trader vs Quant Researcher

  Quant trader vs quant researcher compared: what each actually does day to day, how compensation differs, how the interviews differ, and how to choose.

• The Quant Online Assessment, Explained

  Quant OA formats explained: mental-math sprints, probability MCQs, coding assessments, games, and proctored math tests — with per-firm examples and practice links.