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Prepare for interviews at

Jane StreetJane Street
OptiverOptiver
Citadel SecuritiesCitadel Securities
Two SigmaTwo Sigma
D.E. ShawD.E. Shaw
Hudson River TradingHudson River Trading
Jump TradingJump Trading
IMC TradingIMC Trading
DRWDRW
SIGSIG
Flow TradersFlow Traders
Virtu FinancialVirtu Financial
Jane StreetJane Street
OptiverOptiver
Citadel SecuritiesCitadel Securities
Two SigmaTwo Sigma
D.E. ShawD.E. Shaw
Hudson River TradingHudson River Trading
Jump TradingJump Trading
IMC TradingIMC Trading
DRWDRW
SIGSIG
Flow TradersFlow Traders
Virtu FinancialVirtu Financial

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One focused toolkit built around how quant firms actually interview.

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Question Bank

218 questions total

AllEasyMediumHard
Easy

Expected value of a die roll

Done
Hard

Pricing a European call option using Black-Scholes

Done
Medium

Probability of a random walk returning to origin

Not attempted
Medium

Martingale strategy and its limitations

Not attempted
Hard

Calculate the delta of an at-the-money option

Not attempted

Question Bank

200+ questions across probability, mental math, options theory, and brainteasers — categorized by difficulty and topic, with full worked solutions.

Mental Math Drills

Timed arithmetic and estimation exercises that mirror the speed tests used by Optiver, IMC, and other firms. Track your accuracy and pace over time.

Crash Courses & Firm Guides

Quick-start courses on options, probability, and market structure. Deep-dive interview guides tailored to each firm's known question style.

What traders are saying.

“The question bank on quanttrading.io is the most comprehensive quant interview prep resource I've come across. What sets it apart is that the questions are ones that actually come up in elite firm quant interviews and the worked solutions are clear and genuinely make sense rather than just showing you an answer. Once I had the internship, the guides were incredibly useful in helping me understand what it takes to convert to a grad offer, as the depth of content gave me a strong foundation to draw on throughout my internship. I've been a grad trader and would recommend this to anyone at the internship or pre-internship stage.”

QT Graduate, Jane Street

“I came from a pure maths background and assumed the theory side would carry me through. What I hadn't accounted for was the speed. The timed mental math drills were the thing that actually got my arithmetic to interview pace — it's not just about getting the right answer, it's about getting it in two seconds. The probability and options content builds real intuition rather than just pattern matching, which matters a lot once you're on the desk and the questions stop being textbook.”

Quantitative Analyst, IMC

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  • Progress tracking across the full question bank
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  • Firm guides: Optiver, Jane Street, Citadel, and more
  • Trading simulation games — EV, edge, and risk under pressure
  • Progress tracking across the full question bank
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Full accessSave 36%
  • Most asymmetric upside
  • 200+ practice questions across 3 difficulty tiers
  • Unlimited timed mental math drills
  • All crash courses — options, probability, and more
  • Firm guides: Optiver, Jane Street, Citadel, and more
  • Trading simulation games — EV, edge, and risk under pressure
  • Progress tracking across the full question bank
Get started

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Meet the founder.

Julian, founder of QuantTrading.io

Hi, I'm Julian. I'm a medical doctor who broke into quantitative trading as a medical student with no prior quant background, landing an internship at Susquehanna.

I built QuantTrading.io because the prep resources I found were either too shallow, too scattered, or assumed you already knew everything. This platform is the structured, honest prep guide I wish had existed when I started.

If I could break in from medicine, this platform can help you break in from wherever you are starting — even if it's from zero.