Quant interview preparation
Climb to the offer, one calibrated problem at a time.
An adaptive question bank, a timed mental-math trainer, and a scored market-making simulator — built for candidates targeting Jane Street, Citadel Securities, Optiver, SIG, and the rest of the top tier.
Free tier includes the full mental-math trainer. No card required.
Three tools. One loop.
Every part of the product feeds a single daily habit: show up, practice at the edge of your ability, keep the streak alive.
Pillar 01
Adaptive question bank
Probability, expected value, combinatorics, brainteasers, and statistics — every problem written with a full worked solution and a progressive hint ladder. The engine tracks what you miss and serves the next question at the edge of your ability, not below it.
Pillar 02
Timed mental-math trainer
The 80-in-8-minutes arithmetic screen is the first cut at Optiver, IMC, and most market-making desks. Drill the exact format daily — speed and accuracy tracked per operation type, free forever.
Pillar 03
Market-making simulator
Quote two-sided markets against simulated flow. Manage inventory, survive adverse-selection events, and get a scored breakdown of your spread capture and risk discipline after every round.
Built by a practitioner, not a content farm.
Every question in the bank was written and calibrated by someone who has sat on both sides of these interviews. No scraped problem lists, no AI-generated filler, no answers that hand-wave the hard step. If a worked solution wouldn't survive a follow-up question from an interviewer, it doesn't ship.
- Every solution
- written to interview depth
- Hint ladders
- 3 levels before the reveal
- Difficulty
- calibrated 1–5 per question
- Format
- matches the real screens
Priced for one recruiting cycle.
Start free. When you're ready to go deep, the quarterly plan covers a full 12-week preparation cycle.
Free
$0forever
The daily habit, free.
Pro Quarterly
$59per 3 months
One interview cycle. Best value.
Pro Monthly
$29per month
Everything, month to month.
Frequently asked questions
- Which firms does Quant Ladder prepare me for?
- The content targets the interview formats used at quantitative trading and research firms such as Jane Street, Citadel Securities, Optiver, SIG, IMC, Jump Trading, Hudson River Trading, and Two Sigma. The skills — probability, mental math, market intuition — transfer across all of them.
- Is the mental-math trainer really free?
- Yes. The full timed trainer, streaks, and basic stats are free with an account, forever. Pro unlocks the unlimited question bank, worked solutions, the simulator, and full analytics.
- How is this different from a book of brainteasers?
- Books can't watch you work. The adaptive engine reads every attempt — correctness, speed, hints used — and schedules what you see next, so you spend time where you're weakest instead of re-solving what you already know.
- How long do I need to prepare?
- Most candidates run one recruiting cycle: 8–12 weeks of daily practice. That's why the quarterly plan is the default — it covers a full cycle for less than the cost of two months.
- Can I cancel anytime?
- Yes. Subscriptions are self-serve through the Stripe customer portal, and you keep access until the end of the paid period. See the refund policy for details.