GTS hires Quant Trader, Quant Researcher and Software Engineer. 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.
GTS interview: quick answer
- Stages5
- Online assessmentTimed - algorithms
- Final roundOnsite: Final rounds - the toughest reported problems
- RolesQuant Trader, Quant Researcher, Software Engineer
Preparing for GTS? Work the rounds in order in the free GTS interview funnel.
The GTS interview process at a glance
| # | Round | Format and length | Prep |
|---|---|---|---|
| 1 | Recruiter Screen | Phone - background + fit | Practice |
| 2 | Online Assessment / Coding | Timed - algorithms | OA guidePractice |
| 3 | Probability & Mental Math | 45-60 min - video | GuidePractice |
| 4 | Statistics | 45-60 min - video | 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 GTS round: what it tests and how to prepare
1Recruiter Screen
An intro conversation about background and interest, sometimes with a quick technical warm-up.
How to prepare
- Know why this firm / why the role.
- Warm up mental math + basics.
- Think aloud.
2Online Assessment / Coding
A coding/quant OA: sliding-window and DP problems (cheapest roof covering k cars, subarray optimization).
Question types: mostly coding and optimization, especially hash maps, string algorithms, arrays and counting. Latest candidate report for this round: Jul 2026.
How to prepare
- Sliding window + two pointers.
- DP for sequence/coverage problems.
- Clean, correct, fast.
GTS online assessment guide →Practice this round (12 questions) →
3Probability & Mental Math
Probability, expectation, combinatorics, and brain-teasers -- card-guessing EV (harmonic numbers), races, counting.
Question types: mostly probability, expectation and brain teasers, especially combinatorics, expected value, discrete probability and independence. Latest candidate report for this round: Jul 2026.
How to prepare
- Linearity of expectation -- card-guessing (H_52).
- Counting + combinatorics cleanly.
- Estimate, then formalize.
Full Probability & Mental Math guide →Practice this round (20 questions) →
4Statistics
Statistics and regression brain-teasers: duplicated-data effects on slope/R-squared/t-stat.
Question types: mostly regression and statistics, especially hypothesis testing, variance and correlation. Latest candidate report for this round: Jul 2026.
How to prepare
- Duplicated data -- what changes (t-stat) vs what doesn't (slope, R-squared).
- Estimator intuition.
- Explain the why.
5Onsite: Hardest Rounds
The hardest reported GTS problems across every topic.
Question types: mostly combinatorics, coding and probability, especially conditional probability and dynamic programming.
How to prepare
- Expect the hardest variants across all topics.
- Stay composed under follow-ups.
- Connect the math back to the desk.
Practice the GTS rounds in order
Each round in the GTS funnel has its own practice set, with worked solutions and progress tracking. A free account saves your progress across rounds.
A 4-week GTS prep plan
Built from the order of GTS'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 coding, probability and expectation, the topics that dominate GTS's practice sets. Start with Quant coding course and Probability course. Work the easy and medium questions in the GTS question set. |
| Week 2 | Early rounds: Recruiter Screen, Online Assessment / Coding, Probability & Mental Math and Statistics | Practice coding, probability and expectation under time pressure, and read 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 combinatorics and statistics. 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 GTS?" (see behavioral questions at trading firms). |
About GTS
| Firm type | Electronic market maker / HFT |
|---|---|
| Trading style | Probability + coding · Ultra-low-latency / HFT |
| Founded | 2006 |
| Headquarters | New York, NY |
| Other offices | false |
| Capital | Proprietary (private) |
| Employees | ~400+ |
| Reported performance | ~$0.4-0.9B/yr (est.) |
Culture
A New York electronic market maker (a major NYSE Designated Market Maker) trading across global markets, with an AVT quant-research arm.
What the interviews feel like
Quant-research OA math (probability, statistics, sliding-window coding) plus mental math and EV.
Practice for GTS on QuantVault
Practice
Courses
Games and drills
Further reading
- How quant superdays work
- Behavioral questions at trading firms
- Mental math for trading interviews
- Market-making game interview guide
- 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 May 30, 2026.
- Round detail draws on 11 questions candidates report from GTS interviews (the most recent report across all rounds is from Jul 2026). A separate curated GTS question set of 34 problems collects the most useful practice for this firm.
- 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.
GTS interview FAQ
How many rounds are in the GTS interview?
Candidates report 5 stages: Recruiter Screen, Online Assessment / Coding, Probability & Mental Math, Statistics, Onsite. The exact number varies by cycle and team.
Is there an online assessment at GTS?
Candidates report one: Timed - algorithms. A coding/quant OA: sliding-window and DP problems (cheapest roof covering k cars, subarray optimization).
What happens in the GTS final round?
Onsite (Final rounds - the toughest reported problems). The hardest reported GTS problems across every topic.
How should I prepare for the GTS interview?
Prepare round by round over about four weeks: foundations first, then the early rounds (Recruiter Screen, Online Assessment / Coding, 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 GTS do?
GTS is an electronic market maker / HFT firm headquartered in New York, NY.
Start preparing for GTS
Open the interactive GTS interview funnel: every stage with its practice set, from the first screen to the final round. Create a free account to save your progress.