Quant Interview Guides
Deep dives on the concepts, assessments, and firms behind quantitative-finance interviews - and how to prepare for each with NeetQuant.
Getting Started
How to Prepare for Quant Trading Interviews: A Complete Guide
What quant trading and research interviews test, how the major interview formats differ, and a four-week study plan - probability, expected value, mental math, and market-making.
NeetQuant Team · Jun 2026 · 8 min read
Format Guides
Probability & Market-Making Interviews, Explained
How probability-and-market-making interviews run - the rounds, what each tests, the quoting and betting games, and how to prepare.
NeetQuant Team · Jun 2026 · 6 min read
Format Guides
Timed Speed Assessments in Trading Interviews, Explained
How the timed mental-math and number-sequence screens used by market makers work, what they measure, and how to train for them.
NeetQuant Team · Jun 2026 · 6 min read
Format Guides
EV & Betting-Game Interviews, Explained
How betting-game and expected-value interviews work, what they reveal about your trading judgement, and how to prepare.
NeetQuant Team · Jun 2026 · 6 min read
Format Guides
Multi-Strategy Quant Interviews, Explained
How large multi-strategy platforms hire quants across trader, research, and engineering tracks - and how to prepare for each.
NeetQuant Team · Jun 2026 · 6 min read
Format Guides
Data-Driven Quant Research Interviews, Explained
Collaborative, data-driven quant-research interviews - what they test, the format, and how to prepare.
NeetQuant Team · Jun 2026 · 6 min read
Assessments
How to Crack Speed Mental-Math Tests at Market Makers
What the timed mental-math assessments at speed-focused market makers test, the arithmetic techniques that help, and how to train for them.
NeetQuant Team · Jun 2026 · 7 min read
Assessments
The Probability Online Assessment: Penalty Scoring and How to Beat It
How trading-firm probability OAs use +1/0/-1 penalty scoring, the optimal guess-or-skip strategy, and how to prepare for the format.
NeetQuant Team · Jun 2026 · 6 min read
Assessments
Sequence and Pattern-Recognition Tests, Explained
What the number-sequence assessments used by speed-focused market makers test, the common pattern types, and a systematic way to find the rule fast.
NeetQuant Team · Jun 2026 · 5 min read
Quant Topics
The Kelly Criterion, Explained
How the Kelly criterion sizes bets to maximise long-run growth, the formula, a worked example, and why traders use fractional Kelly.
NeetQuant Team · Jun 2026 · 6 min read
Quant Topics
The St. Petersburg Paradox
A coin-flip game with infinite expected value that almost no one would pay much to play - and how utility and the Kelly criterion resolve it.
NeetQuant Team · Jun 2026 · 5 min read
Quant Topics
Martingales and the Optional Stopping Theorem
Why no betting system beats a fair game, why the 'double until you win' strategy is doomed, and what martingales reveal about random walks.
NeetQuant Team · Jun 2026 · 6 min read
Quant Topics
The Options Greeks, Explained
Delta, gamma, theta, vega, and rho - how traders measure and hedge an option's risk, and the gamma–theta trade-off that decides who actually makes money.
NeetQuant Team · Jun 2026 · 9 min read
Quant Topics
Black–Scholes and Risk-Neutral Pricing, Intuitively
Why an option has a single fair price at all - no-arbitrage, replication, and the risk-neutral trick - without the differential equation.
NeetQuant Team · Jun 2026 · 6 min read
Process & Careers
A Four-Week Quant Interview Prep Plan
A week-by-week plan for preparing for quant trading and research interviews from a standing start, with what to cut when time is short.
NeetQuant · Aug 2026 · 6 min read
Process & Careers
How to Think Out Loud in a Quant Interview
Most quant interviews mark your reasoning, not just your answer. How to narrate a problem without rambling, and what interviewers are listening for.
NeetQuant · Aug 2026 · 5 min read
Process & Careers
The Most Common Quant Interview Mistakes
The errors that cost candidates offers most often - and why almost none of them are about not knowing enough maths.
NeetQuant · Aug 2026 · 5 min read
Process & Careers
What to Do the Night Before a Quant Interview
The last twenty-four hours change less than candidates think - but there are a few things worth doing, and several worth not doing.
NeetQuant · Aug 2026 · 4 min read
Process & Careers
Moving from a PhD to Quant Research
What transfers from academic research to a quant role, what does not, and how to present a thesis to an interviewer who will not read it.
NeetQuant · Aug 2026 · 6 min read
Process & Careers
Breaking into Quant from a Non-Target School
How quant hiring differs from banking recruitment, why the online assessment helps candidates without a pedigree, and where to spend your effort.
NeetQuant · Aug 2026 · 5 min read
Process & Careers
Quant Trader vs Quant Researcher: Which Role to Target
How the two roles differ in day-to-day work, what each interview selects for, and how to tell which one you should be preparing for.
NeetQuant · Aug 2026 · 5 min read
Process & Careers
Surviving a Quant Superday
Back-to-back interviews, a trading game and a lunch that is also an interview. How to manage a full assessment day without fading.
NeetQuant · Aug 2026 · 5 min read
Process & Careers
Behavioural Questions in Quant Interviews
Quant firms ask fewer behavioural questions than banks, but the ones they ask are load-bearing. What they are actually testing.
NeetQuant · Aug 2026 · 4 min read
Process & Careers
The Quant Internship Recruiting Timeline
Quant recruiting runs earlier than general graduate hiring. When applications open, how long processes take, and what eligibility rules to check.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Linearity of Expectation: The Most Useful Trick in Quant Interviews
Expectations add even when the events are dependent. Why that is surprising, and the interview problems it solves in one line.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
Conditioning: The Law of Total Probability in Interviews
Split on the first step, solve the pieces, recombine. The single most reliable attack on a probability question you cannot see through.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
Bayes' Theorem for Quant Interviews
The base rate is the whole question. How to set up Bayes problems so the arithmetic is trivial, and why the famous test-accuracy trap works.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
Symmetry Arguments: Solving Problems Without Calculating
Some interview problems have no arithmetic in them at all. Recognising symmetry turns a page of algebra into a sentence.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Indicator Random Variables
The bridge between counting and expectation. How to turn 'how many' questions into a sum of probabilities.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Conditional Expectation and the Tower Property
E[X] = E[E[X|Y]] is the most useful identity in applied probability. What it means and how it turns hard problems into easy ones.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Waiting Times: Geometric and Exponential Distributions
How long until the first success, why the answer is 1/p, and the memorylessness property that interviewers test with a trick question.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Gambler's Ruin Explained
How long a random walk survives before hitting zero, why a fair game still ruins you against an infinite opponent, and the interview forms it takes.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
Random Walks in Quant Interviews
Expected distance, recurrence, hitting times and reflection - the random-walk facts that come up repeatedly and the intuitions behind them.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
Markov Chains for Quant Interviews
State, transition, stationary distribution and expected hitting time - the minimum you need, and how to spot a chain hiding in a word problem.
NeetQuant · Aug 2026 · 5 min read
Probability Techniques
The Inclusion-Exclusion Principle
Counting overlapping sets without double-counting. The formula, the derangement application, and when a complement is faster.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
Order Statistics: Maxima, Minima and Uniform Spacings
Expected maximum of n uniforms, why the spacings are all the same size, and the interview questions built on both.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
The Coupon Collector Problem
How long to collect all n coupons, why the answer is n log n, and why the last few take most of the time.
NeetQuant · Aug 2026 · 4 min read
Probability Techniques
The Birthday Problem Explained
Why 23 people is enough for a coin-flip chance of a shared birthday, and the square-root scaling that makes it generalise.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The Monty Hall Problem
Why switching wins two-thirds of the time, the assumption that makes it work, and the variant interviewers use to check you understand it.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The Two Envelopes Paradox
An argument that says always switch, and switch again forever. Finding the flaw is the actual interview question.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The 100 Prisoners Problem
A strategy that raises the survival chance from an astronomically small number to over 30%. The cycle-following trick explained.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The Burning Ropes Puzzle
Measure 45 minutes with two ropes that burn unevenly. The trick is realising you can light both ends.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The Twelve Balls Weighing Puzzle
Find the odd ball among twelve in three weighings, and the information-theoretic argument that tells you it must be possible.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The Pirate Gold Problem
Five pirates divide 100 coins by vote, with death for a losing proposer. Backward induction gives a startlingly greedy answer.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
Ants on a Stick
Ants collide and reverse. The answer becomes obvious once you notice the collisions do not matter at all.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
Hat Guessing Puzzles
Prisoners in a line guessing hat colours. A parity strategy saves all but one, and the same idea drives the harder variants.
NeetQuant · Aug 2026 · 4 min read
Brainteasers
The Bridge Crossing Puzzle
Four people, one torch, seventeen minutes. The greedy solution fails and the reason it fails is the point.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The Poisoned Wine Puzzle
One poisoned bottle among a thousand, and only ten testers. Binary encoding solves it exactly.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
Clock Angle Problems
How often the hands overlap, the angle at any given time, and why the answer is 22 rather than 24.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The 100 Lockers Puzzle
Toggle every locker, then every second, then every third. Only the perfect squares stay open, and the reason is about divisors.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The Jeep Problem: Crossing the Desert
How far can you go if you must carry your own fuel and can cache it along the way? A harmonic series appears.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
Breaking a Stick: The Triangle Problem
Break a stick at two random points. The probability the pieces form a triangle is 1/4, and the geometric argument is the elegant part.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The Two Bullets Puzzle
Two bullets in adjacent chambers, one click survived. Should you spin again? A clean conditional probability question.
NeetQuant · Aug 2026 · 3 min read
Brainteasers
The Red Card Game: When to Stop
Deal cards one at a time and bet the next is red. A martingale argument shows every stopping rule gives the same answer.
NeetQuant · Aug 2026 · 4 min read
Market Making
How to Make a Market in an Interview
The signature trading-interview exercise. How to quote, how wide, and what the interviewer is actually scoring.
NeetQuant · Aug 2026 · 5 min read
Market Making
The Bid-Ask Spread Explained
What the spread compensates a market maker for, why it widens, and what determines its size in practice.
NeetQuant · Aug 2026 · 4 min read
Market Making
Adverse Selection: Why Getting Filled Is Bad News
The core hazard of market making. If your quote keeps getting hit, the market is telling you something.
NeetQuant · Aug 2026 · 4 min read
Market Making
Inventory Risk and Skewing Your Quotes
Once you hold a position you are no longer neutral. How and why to move your market after a trade.
NeetQuant · Aug 2026 · 4 min read
Market Making
Edge and Expected Value in Trading
What traders mean by edge, how it relates to expected value, and why a positive-EV trade can still be a bad trade.
NeetQuant · Aug 2026 · 4 min read
Market Making
Position Sizing: How Much to Bet
Having an edge is half the problem. Sizing decides whether you keep it.
NeetQuant · Aug 2026 · 4 min read
Market Making
Liquidity and Market Impact
Why a large order costs more than a small one, the square-root law, and what liquidity actually means.
NeetQuant · Aug 2026 · 4 min read
Market Making
How the Order Book Works
Limit orders, market orders, price-time priority and what the book tells you. The market microstructure interviewers expect you to know.
NeetQuant · Aug 2026 · 4 min read
Market Making
Arbitrage and Relative Value
True arbitrage, statistical arbitrage, and why the textbook risk-free trade almost never exists in practice.
NeetQuant · Aug 2026 · 4 min read
Market Making
Reading the Counterparty in a Trading Game
In an interview trading game the interviewer is also a player. What their trades tell you and how to respond.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Put-Call Parity Explained
The one genuine no-arbitrage relationship in options. What it says, why it must hold, and the interview questions built on it.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Delta: Sensitivity, Hedge Ratio and Probability
Delta means three things at once. Understanding all three is what interviewers are checking.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Gamma and Convexity
Why owning options means profiting from movement, and why gamma is what you actually pay for with time decay.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Delta Hedging Explained
How a market maker removes directional risk from an options book, and why the hedge must be continuously adjusted.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Implied Volatility Explained
The market's forecast of future movement, backed out of option prices. Why traders quote vol instead of price.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Vega and Theta
Sensitivity to volatility and to the passage of time - the two Greeks that decide whether owning options pays.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Gamma Scalping
How a long-gamma position converts movement into profit through rehedging, and why it is a bet on realised versus implied volatility.
NeetQuant · Aug 2026 · 3 min read
Options & Derivatives
The Volatility Smile and Skew
Black-Scholes assumes one volatility for all strikes. The market disagrees, and the shape of that disagreement is informative.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
The Binomial Option Pricing Model
Price an option in one step with no probability at all. The clearest route into risk-neutral pricing.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
Straddles, Strangles and Spreads
The standard option structures, what each expresses, and how to reason about their payoffs quickly in an interview.
NeetQuant · Aug 2026 · 4 min read
Options & Derivatives
American vs European Options: When to Exercise Early
Why you should never exercise an American call on a non-dividend stock early, and why a put is different.
NeetQuant · Aug 2026 · 3 min read
Options & Derivatives
Forwards, Futures and the Cost of Carry
Why the forward price is not a forecast, how carry determines it, and the difference futures margining makes.
NeetQuant · Aug 2026 · 4 min read
Statistics
The Central Limit Theorem in Interviews
Why sums become normal, how fast, and the conditions candidates forget to check.
NeetQuant · Aug 2026 · 4 min read
Statistics
Linear Regression for Quant Interviews
What the coefficients mean, what the assumptions are, and the questions interviewers actually ask about it.
NeetQuant · Aug 2026 · 5 min read
Statistics
Hypothesis Testing and p-values
What a p-value is and is not, why multiple testing destroys naive inference, and how that applies to backtests.
NeetQuant · Aug 2026 · 4 min read
Statistics
The Bias-Variance Trade-off
Why the best model is not the one that fits your data best, and how the decomposition guides model choice.
NeetQuant · Aug 2026 · 4 min read
Statistics
Correlation and Covariance
What correlation measures, what it misses, and the portfolio intuition interviewers expect.
NeetQuant · Aug 2026 · 4 min read
Statistics
Maximum Likelihood Estimation
Choose the parameters that make your data most probable. What MLE guarantees, and where it goes wrong.
NeetQuant · Aug 2026 · 4 min read
Statistics
The Distributions You Need to Know
Binomial, Poisson, normal, exponential and lognormal - when each arises and the relationships between them.
NeetQuant · Aug 2026 · 4 min read
Statistics
The Sharpe Ratio Explained
Return per unit of risk, how it scales with time, and why it takes so long to measure.
NeetQuant · Aug 2026 · 4 min read
Statistics
Survivorship Bias and Other Data Traps
The biases that make backtests look better than reality - and the questions interviewers use to find out whether you know them.
NeetQuant · Aug 2026 · 4 min read
Statistics
Experiment Design for Quant Research
How to design a test that can actually change your mind, and the questions interviewers ask about validation.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Mental Multiplication Techniques
The handful of tricks that cover most two-digit multiplications on a timed screen, and how to choose between them fast.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Percentages and Fractions in Your Head
Percentage questions dominate trading screens. The reversal trick, the fraction table, and compound approximations.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Mental Division and Fast Estimation
Division is slower than multiplication, so convert it. Reciprocals, factoring and how much precision you actually need.
NeetQuant · Aug 2026 · 3 min read
Mental Math
Squares, Roots and Powers in Your Head
The reference values worth memorising and the approximation methods for everything else.
NeetQuant · Aug 2026 · 3 min read
Mental Math
Fermi Estimation for Interviews
How many piano tuners in Chicago? The structured approach to estimating anything, and why interviewers care.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Spotting Number Sequence Patterns
A checklist for sequence tests, ordered by how often each pattern appears, so you stop guessing and start searching.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Timed Test Strategy and Pacing
How to allocate time, when to skip, and why accuracy before speed is the right order of operations.
NeetQuant · Aug 2026 · 4 min read
Mental Math
Building Number Sense
The intuition that makes arithmetic fast: recognising factors, spotting impossible answers, and knowing when a result smells wrong.
NeetQuant · Aug 2026 · 3 min read
Programming
Python for Quant Interviews
What quant coding rounds actually test in Python, and the library fluency that is assumed rather than taught.
NeetQuant · Aug 2026 · 4 min read
Programming
C++ for Low-Latency Interviews
Trading technology interviews go far below language syntax. Memory layout, cache behaviour and what actually costs time.
NeetQuant · Aug 2026 · 5 min read
Programming
Time and Space Complexity for Interviews
How to analyse complexity out loud, the cases people get wrong, and why constants sometimes matter more than the exponent.
NeetQuant · Aug 2026 · 4 min read
Programming
Arrays, Two Pointers and Sliding Windows
The patterns that solve most array questions in linear time, and how to recognise which applies.
NeetQuant · Aug 2026 · 4 min read
Programming
Dynamic Programming for Quant Interviews
Recognising when a problem has optimal substructure, and the connection to the recursions you already use in probability.
NeetQuant · Aug 2026 · 4 min read
Programming
SQL for Quant Research Interviews
Window functions, joins and the time-series patterns that come up when quant data lives in a database.
NeetQuant · Aug 2026 · 4 min read
Programming
Numerical Methods for Quant Interviews
Root finding, Monte Carlo and floating point - the computational topics that come up in pricing and research rounds.
NeetQuant · Aug 2026 · 4 min read
Programming
Trading System Design Interviews
Order books, market data handling and risk checks - what a systems round for a trading firm actually covers.
NeetQuant · Aug 2026 · 4 min read