Flow Traders Interview ProcessTier 4

ETF / ETP Market Maker - Amsterdam

53 practice questions → Apply at Flow Traders → Learn more about Flow Traders ↗ Report a question from your Flow Traders interview

problems

27 easy 42 medium 15 hard

hires: Trader, Quant Researcher, Trading Technology

Recruiter / Screen

Phone - background + fit

An intro conversation about background and interest, sometimes with a quick technical warm-up.

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Editorial round — no practice problems.

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56 firmsEvery stageMust-do problems

Online Assessment (by track)

Flow Traders is a low-latency ETF market maker, and its OA reflects that profile: it tests language fluency far more than algorithms. The screen is roughly 7 multiple-choice questions on uncommon C++ and Python quirks (output prediction, undefined behavior, evaluation order) plus 3 coding problems - 2 easy and 1 harder (a reported 'Job Scheduling' balanced-processors question). Know your language corner cases cold.

Practice this round 5 problems Pro

Trader / Junior Dev

current

2024 -> 2026

Language MCQ + codingtimed, MCQ + coding~7 MCQ + 3 coding

A short, fast screen: about 7 multiple-choice 'what does this print' questions on less-common C++ / Python syntax (operator precedence, integer division, pre/post-increment, list aliasing, default mutable arguments, short-circuit evaluation, char arithmetic), then 3 coding problems (2 straightforward, 1 harder). The timed MCQ section below reproduces the language-quirk half on the clock.

Flow Traders numerical test: arithmetic + sequences replicaThe trader numerical screen, freePro Zetamac practice game: free 2-minute arithmetic sprintDefault Zetamac settings, per-operation breakdownPro Mental math for trading interviews: what each firm testsEvery firm screen in one tablePro

Take the timed assessmentReal reported OA questions, on the clockPro

current

2024 -> 2026

Coding (2 easy + 1 harder)timed3 problems

After the language-quirk MCQs, the OA has 3 coding problems (2 easy, 1 harder). Auto-graded below.

Second Largest Distinct Value"Second largest distinct" is just the maximum of what is left after you remove every copy of the maximum. Deduplicating into a set kills the duplicate trap, andCodingEasySolve →Balanced BracketsScan left to right with a stack. Push every opening bracket. On a closing bracket, the only way nesting can be proper is if it matches the bracket on TOP of theCodingEasySolve →Balanced Job Scheduling: Max Jobs on the Fast ProcessorReported in this firm OA; auto-graded.CodingMediumSolve →

current

2024 -> 2026

Probability & statisticstimed2 questions

Candidate-reported probability and statistics questions from a Flow Traders screen, alongside the language quirks and coding.

Practice Flow Traders OA problemsPro

Radial Distance Distribution in a Uniform DiskThe polar-coordinates transform the Flow Traders screen asks for: derive the density of the radius of a uniform point in the unit disk and read off why it is not uniform.ProbabilityMediumSolve →Type I and Type II Error Trade-off in a Gaussian Z-TestThe hypothesis-testing half: set up the z-test, pick the rejection region, and reason about the two error rates the way the fairness question expects.StatisticsMediumSolve →

reported

2024 -> 2026

Quant Research (Junior): Fast Fire 2.1Online assessment, multiple choice plus codingMCQ + coding

Candidate report, September 2026. Prepare it with the statistics and coding problems in the Flow Traders set plus the timed replica for the MCQ and coding halves; the numerical sequence test is the trader track screen.

Flow Traders timed replica (MCQ + coding)Pro Flow Traders interview questionsPro

Probability & Mental Math

45-60 min - video Round guide →

Probability, expectation, combinatorics, and brain-teasers, plus fast mental arithmetic and sequences.

Practice this round 40 problems →

#2407 What Denominators Allow a Ratio Near One-Half brain-teaser medium #854 Shuffle Permutation Order for 14 Cards combinatorics medium #607 Mean and Variance of a Mixture of Normals expectation medium #142 The Gaussian Integral probability medium #1481 Radial Distance Distribution in a Uniform Diskseen 2022-04 random-variables medium #2416 How Would You Raise a Company's Profit? brain-teaser medium #1017 Permutations With No Adjacent Evens combinatorics medium #694 Conditional Expectation of Brownian Motion Given Its Absolute Value expectation medium #147 Triangle From Breaking the Longer Piece probability medium #3739 Busy Days and Quiet Days: Volatility of a Two-Regime Book random-variables medium

ETF & Market Making

45-60 min - trading intuition Round guide →

ETF/ETP mechanics (creation/redemption, leveraged-ETF rebalancing), basic options, and market-making intuition.

Practice this round 40 problems →

#1386 Defining an Alpha Signal finance medium #2130 DeFi-CeFi Arbitrage Mechanics and Price Impact Estimation market-microstructure medium #1941 Delta-Normal VaR with Correlation options-pricing medium #2153 Make-or-Take Decision with Drift Forecasts finance medium #3049 Hedging an ETF When an Underlying's Market Is Closedseen 2026-07 market-microstructure medium #2041 Path-Dependent Delta: Sudden Jump vs. Gradual Declineseen 2023-06 options-pricing medium #2568 Rebalancing a 3x Leveraged Oil ETFseen 2023-12 finance medium #3050 Why Leveraged ETFs Decay: Daily Reset and Volatility Dragseen 2026-07 market-microstructure medium #3047 Long Call vs Short Straddle: Who Wins When ETH Lands on the Strike?seen 2026-07 options-pricing medium #3068 Cost-of-Carry Futures Pricing: Where Does Storage Cost Enter?seen 2026-07 finance medium

Onsite - Hardest Rounds

Final rounds - the toughest reported problems

The hardest reported Flow Traders problems across every topic. (Hard-rated only; earlier rounds cover easy/medium, so nothing repeats.)

Practice this round 40 problems →

#1325 Sliding Window Median Data Structure coding hard #1162 Max Sum Pairwise Coprime Subset combinatorics hard #402 Expected Triangle Area on a Unit Sphere expectation hard #2191 Two-Sided Market Making With Overround finance hard #2518 Build an Order-Matching Engine: Limit, Market, Stop, Cancel market-microstructure hard #1907 Bayesian Pricing of a Threshold Digital options-pricing hard #783 Gaussian Wedge Probability probability hard #2113 Aho-Corasick Multiple-Pattern Matching coding hard #3737 Average Distance Between Two Random Points in a Unit Square expectation hard #3065 Measuring Lead-Lag Between Two Venues and Where to Run the Modelseen 2026-07 market-microstructure hard #2195 Vertical Call Spread Greeks Analysis options-pricing hard #832 Posterior Update from a Trade Followed by Silence probability hard

The day before

Online Assessment / Coding
Probability & Mental Math
ETF & Market Making
Onsite - Hardest Rounds

Cheatsheet →

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Practice every firm's OA: timed replicas, free game replicas and guides in one place →

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Flow Traders round-by-round guides

Flow Traders interview guide: the firm, culture, roles and pay →

Stage guides for every firm: superdays · behavioral questions · market-making games

Flow Traders interview — FAQ

What is the Flow Traders interview process?

Flow Traders is a global ETF/ETP market maker. Expect fast mental math, probability and EV, ETF mechanics (leveraged-ETF rebalancing), and a coding OA for quant/tech roles. The final round is an ETF case study with senior traders; some reports also describe a market-making game on the assessment day. The loop runs 5 stages: Recruiter / Screen, Online Assessment (by track), Probability & Mental Math, ETF & Market Making, Onsite - Hardest Rounds.

How many rounds does Flow Traders have?

5 stages in total, starting with the Recruiter / Screen and ending with the Onsite - Hardest Rounds.

How do I prepare for the Flow Traders interview?

Work the stage notes above, then drill the Flow Traders interview-questions set and the Flow Traders online-assessment practice — each problem has a full worked solution.