Flow Traders hires Trader, Quant Researcher and Trading Technology. Candidates report 5 interview stages. Below: what each round tests and how to prepare, the timeline, roles and a 4-week prep plan, drawn from candidate reports and Flow Traders's own recruiting pages.
Flow Traders interview: quick answer
- Stages5
- Online assessmentTrader: timed mental maths + sequences · Tech: language MCQ + coding · QR: Fast Fire
- Final roundOnsite: Final rounds - the toughest reported problems
- RolesTrader, Quant Researcher, Trading Technology
Preparing for Flow Traders? Work the rounds in order in the free Flow Traders interview funnel, or start with the free online-assessment sample (no signup).
The Flow Traders interview process at a glance
| # | Round | Format and length | Prep |
|---|---|---|---|
| 1 | Recruiter Screen | Phone - background + fit | Practice |
| 2 | Online Assessment | Trader: timed mental maths + sequences · Tech: language MCQ + coding · QR: Fast Fire | OA guidePractice |
| 3 | Probability & Mental Math | 45-60 min - video | GuidePractice |
| 4 | ETF & Market Making | 45-60 min - trading intuition | GuidePractice |
| 5 | Onsite Hardest Rounds | Final rounds - the toughest reported problems | Practice |
Stages are listed in the order candidates report them. Formats come from candidate reports and change between cycles, offices and teams; not every candidate sees every stage.
Every Flow Traders round: what it tests and how to prepare
1Recruiter Screen
An intro conversation about background and interest, sometimes with a quick technical warm-up.
- Expect a motivation interview with HR that also checks whether you understand how an ETF is priced and hedged.
How to prepare
- Know why this firm / why the role.
- Warm up mental math + basics.
- Think aloud.
2Online Assessment
Trading applicants sit a timed test of mental arithmetic and number sequences, which is the main early cut. Tech candidates get a coding screen (array/matrix problems, prefix-sum reconstruction, anomaly detection). Quant Research applicants (September 2026 report) instead get two back-to-back take-homes: 25 MCQ plus 5 integral-heavy questions in 15 minutes on statistics, ML (lasso/ridge, feature selection) and Brownian motion, then Fast Fire 2.2: 6 short-answer probability questions and 1 Python Monte Carlo task in 30 minutes.
Question types: mostly expectation, coding and probability, especially expected value, conditional probability, discrete probability and independence. Latest candidate report for this round: Jul 2026.
How to prepare
- QR track: two take-homes back to back -- stats/ML MCQ with integrals first, then 6 fast probability questions plus one Python Monte Carlo in 30 minutes. Know binomial moments, normal mixtures and the Q function cold.
- Array/matrix manipulation -- prefix sums, reconstruction.
- Clean, correct code with stated complexity.
Flow Traders online assessment guide →Practice this round (31 questions) →
3Probability & Mental Math
Probability, expectation, combinatorics, and brain-teasers, plus fast mental arithmetic and sequences.
Question types: mostly expectation, brain teasers and probability, especially expected value, combinatorics, conditional probability and discrete probability. Latest candidate report for this round: Jul 2026.
How to prepare
- Fast EV -- dice products, lopsided bets.
- Conditional probability (Bayesian rainy-Friday type).
- Sequence/pattern puzzles appear.
Full Probability & Mental Math guide →Practice this round (34 questions) →
4ETF & Market Making
ETF/ETP mechanics (creation/redemption, leveraged-ETF rebalancing), basic options, and market-making intuition.
Question types: mostly market microstructure, finance and options pricing, especially risk management, correlation, volatility and aggregation. Latest candidate report for this round: Jul 2026.
How to prepare
- Leveraged-ETF rebalancing -- daily reset mechanics.
- Creation/redemption arbitrage.
- Quote + manage risk intuitively.
Full ETF & Market Making guide →Practice this round (22 questions) →
5Onsite: Hardest Rounds
The hardest reported Flow Traders problems across every topic.
Question types: mostly probability, coding and expectation, especially data structures, expected value, market microstructure and conditional probability. Latest candidate report for this round: Jul 2026.
How to prepare
- Expect the hardest variants across all topics.
- Stay composed under follow-ups.
- Connect the math back to the desk.
Practice the Flow Traders rounds in order
Each round in the Flow Traders funnel has its own practice set, with worked solutions and progress tracking. A free account saves your progress across rounds.
A 4-week Flow Traders prep plan
Built from the order of Flow Traders's rounds and the topics in each round's practice set. Compress it if your first interview is sooner.
| When | Focus | What to do |
|---|---|---|
| Week 1 | Foundations | Review expectation, probability and market microstructure, the topics that dominate Flow Traders's practice sets. Start with Probability course and Market making & microstructure course. Work the easy and medium questions in the Flow Traders question set. |
| Week 2 | Early rounds: Recruiter Screen, Online Assessment, Probability & Mental Math and ETF & Market Making | Practice expectation, probability and market microstructure under time pressure, and take the free OA sample (format notes in the OA guide). Add a daily mental-math drill. Talk every answer through out loud; interviewers score the reasoning. |
| Week 3 | Later rounds: Onsite | Move to coding, market microstructure and options pricing. Read how quant superdays work. |
| Week 4 | Rehearse the full loop | Run each practice round in order, redo the questions you missed, and prepare two project stories plus a specific answer to "why Flow Traders?" (see behavioral questions at trading firms). |
About Flow Traders
| Firm type | ETP/ETF market maker (publicly listed) |
|---|---|
| Trading style | Mental math + probability + ETF · ETP/ETF market making |
| Founded | 2004 |
| Headquarters | Amsterdam (+ NY, HK, Singapore) |
| Other offices | false |
| Net trading income | EUR 467.8m (2024) |
| Employees | ~609 |
| Reported performance | EUR 467.8m NTI (2024, +56%) |
| Trader online test | Timed mental arithmetic plus number sequences |
| Final round | An ETF case study with senior traders |
Culture
A leading global ETP/ETF market maker headquartered in Amsterdam, publicly listed, with desks in New York, Hong Kong, and Singapore. Fast, trading-floor culture.
What the interviews feel like
Fast mental math and probability/EV, ETF/leveraged-ETF mechanics, and a coding OA for quant/tech roles.
Practice for Flow Traders on QuantVault
Practice
Courses
Games and drills
Further reading
- How quant superdays work
- Market-making game interview guide
- Behavioral questions at trading firms
- Mental math for trading interviews
- The quant interview process, explained
Similar firms to compare
Firms with a similar business and interview style. Many candidates interview at several of them in the same cycle.
Sources and how this guide is built
- Updated October 20, 2026; firm data last reviewed September 8, 2026.
- Round detail draws on 38 questions candidates report from Flow Traders interviews (the most recent report across all rounds is from Jul 2026). A separate curated Flow Traders question set of 53 problems collects the most useful practice for this firm.
- Flow Traders's own pages: Flow Traders careers.
- Public candidate reports and outside interview guides are cross-checked against each other. Where they disagree the page says "reports differ"; details from a single source are marked as candidate reports.
- No actual interview questions are reproduced on this page. The questions, with worked solutions, are in the practice rounds.
Flow Traders interview FAQ
How many rounds are in the Flow Traders interview?
Candidates report 5 stages: Recruiter Screen, Online Assessment, Probability & Mental Math, ETF & Market Making, Onsite. The exact number varies by cycle and team.
Is there an online assessment at Flow Traders?
Candidates report one: Trader: timed mental maths + sequences · Tech: language MCQ + coding · QR: Fast Fire. Trading applicants sit a timed test of mental arithmetic and number sequences, which is the main early cut. Tech candidates get a coding screen (array/matrix problems, prefix-sum reconstruction, anomaly detection).
What happens in the Flow Traders final round?
Onsite (Final rounds - the toughest reported problems). The hardest reported Flow Traders problems across every topic.
How should I prepare for the Flow Traders interview?
Prepare round by round over about four weeks: foundations first, then the early rounds (Recruiter Screen, Online Assessment, Probability & Mental Math), then the later rounds, then a full rehearsal. Each round has its own practice set on QuantVault, and the online assessment has a dedicated guide.
What does Flow Traders do?
Flow Traders is an ETP/ETF market maker headquartered in Amsterdam (+ NY, HK, Singapore).
What is on the Flow Traders trader test?
Timed mental arithmetic and number sequences. It is the main early cut for trading applicants.
Is there a case study at Flow Traders?
Yes. The final round is an ETF case study run by senior traders, often ending with a short presentation of your view.
Is there a trading game?
Reports differ. Some reports describe a market-making game on the assessment day, while other accounts point to the case study as the main final exercise.
Start preparing for Flow Traders
Open the interactive Flow Traders interview funnel: every stage with its practice set, from the first screen to the final round. Create a free account to save your progress.