2,600+ problems • 152+ firms

Ace every quant
interview question.
Go deeper than anyone.

~400 problems free with full solutions. Go Pro to unlock all 2,600+ problems, the adaptive study plan, every company funnel, and 40+ courses. 400 problems free — go Pro for all 2,600+, study plans, and 40+ courses.

Start Practicing Personalize Your Journey
New to quant? Explore our interactive courses →
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Problems
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Firms
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Topics
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Courses
quantvault.org/problems
Trusted by candidates interviewing at
Why QuantVault

Built for the interviews other sites ignore.

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Curated Problems & Solutions
The largest curated quant-interview bank — probability, stochastic calc, options, coding — each with a full, intuition-first solution. No answer-only stubs.
40+ Intuition-First Courses
Structured lectures that build real understanding — not rote formulas — from probability to portfolio theory.
Industry-Insider Knowledge
Built by quants from the desks. What each firm actually tests, how the business works, and how to break in.
Company Funnel + Trading Games
Prep mapped to each firm’s real rounds, plus playable market-making and betting games built from real super-days.
Company funnel

Prep by firm, the way they really interview

Every firm maps to its real pipeline. Drill each round with the problems that show up there.

QR pipeline
1
Resume screen
2
Online assessment
3×
Technical rounds
3×
Hiring-manager rounds
MD
Senior MD call
★
Offer
What to drill
Systematic research. Expect deep probability, statistics and time-series, plus a coding-heavy online assessment before the technical loop.
ProbabilityStatisticsTime SeriesMLCoding
QT pipeline
1
Resume screen
2–4
Interview rounds
AM
Super-day, morning
PM
Super-day, afternoon
★
Offer
What to drill
Market making. Fast mental math, market-making intuition and expected-value games dominate the super-day rounds.
Mental MathMarket MakingEV GamesProbability
Trading games

Trading games built from real interviews

The market-making and betting games firms run on super-days. Playable, with diagnostic scoring.

Jane St · super-day
Three-Dice Market Maker
Quote two-sided markets on hidden dice and manage inventory across turns. Scored on discipline, not luck.
5 rounds~8 minInventory risk
▶ Play Optiver · round 1
Probability Market-Taking
Find the +EV bet and the arbitrage across a board of live odds, under a timer.
4 blocks2-min endless
▶ Play Market making
RGB Counts
Price a product on hidden colored draws. Search for fair value and hedge the downside.
5 roundsSealed-bid
▶ Play
Learn

Learn the theory, then drill it

Start with the featured lecture, then follow the syllabus from first principles to the topics every desk tests.

Our Story

Built by quants who’ve been through it.

I’m Stanley, a quant researcher at one of the top funds. During my previous non-compete I started tutoring students prepping for quant interviews, and I kept noticing the same thing. Brilliant people who had aced every exam still got blindsided by topics no course ever taught them. Prep sites barely scratch the surface, but real interviews go much deeper. So I teamed up with friends across the industry, traders and researchers at the desks that actually run these pipelines, and together we built QuantVault. 2,600+ problems with full, intuition-first solutions, 40+ courses, and the firm-by-firm interview maps we wish we’d had. We’re in our early days, with a low founding subscription price to match, and your feedback directly shapes what we build next. Stanley & the QuantVault team

FAQ

Common questions

What topics are covered? ▶
2,600+ problems across 17 topics — probability, stochastic calculus, linear algebra, statistics, options & derivatives, optimization, machine learning, brain teasers, coding, game theory, market microstructure, and more. Plus 40+ interactive courses that teach each topic from first principles — so you learn the theory, then drill it.
Is it free? ▶
Yes — ~400 curated problems, the skill assessment, the trading-game tutorials, and the Intro course are free forever. QuantVault Pro ($19/mo or $180/yr) unlocks all 2,600+ problems with full solutions, the adaptive study plan, every company funnel (27 firms), all 15 trading games, and 40+ courses.
Who is this for? ▶
Students, recent grads, and working professionals prepping for quant trader, quant researcher, and quant developer interviews. It takes you from first principles all the way up to desk-level — useful whether you’re technically strong but missing the specific topics quant interviews test, or building from the ground up.
How is this different from other prep sites? ▶
Real interview funnels for each firm, intuition-first solutions on every problem, an adaptive per-topic Elo study plan that targets your weak spots, and interactive trading-game simulators you can actually play — not just a static problem dump. It goes the full depth of real quant interviews: stochastic calculus, derivatives pricing, optimization, statistics, and real coding rounds.