Susquehanna International Group Quantitative Trader interview questions & guide 2026

The interview process is designed to test your raw problem-solving ability and your "trading intuition." Do not expect to memorize answers; instead, focus on explaining your thought process clearly, as interviewers are more interested in how you arrive at a solution than the final number.

Statistics & Probability

These questions form the core of the Susquehanna International Group interview. You will be asked to compute probabilities, expected values, and handle combinatorics under time pressure.

• Compute the probability that two independent events occur simultaneously within a fixed time window.
• If you flip a fair coin until you reach a specific sequence (e.g., HTH), what is the expected number of flips?

Preparation at Susquehanna International Group is about building "quant muscle memory." You need to be fast, accurate, and comfortable with uncertainty.

Probability & Expected Value – This is the most critical area. You must be able to calculate EVs in your head or on scratch paper without hesitation. Practice common puzzles (dice, cards, coins) and ensure you understand the underlying math behind Bayes' Theorem and combinatorics.

Mental Math & Speed – You will often face time-pressured tests. Practice multiplying small numbers, fractions, and percentages. The goal is to reach a correct answer quickly while maintaining a narrative of your logic for the interviewer.

Commercial & Market Awareness – While you aren't expected to be a macro economist, you should understand the basics of what market making is. Understand why liquidity is valuable and how a market maker manages the risk of being "picked off" by informed traders.

Fit & Motivation – Susquehanna International Group is a tight-knit, competitive group. Demonstrate that you have a genuine interest in games (poker, strategy games) and that you are coachable. They look for people who are intellectually curious and enjoy being wrong if it leads to a better understanding of the truth.

The interview process at Susquehanna International Group is rigorous, consistent, and highly focused on your ability to reason through problems. It typically begins with a timed Online Assessment (OA), which serves as a broad filter. This assessment is heavy on probability, combinatorics, and logic puzzles. If you pass the OA, you will likely move into a series of phone or video interviews, which serve as "vibe checks" and technical screens.

The final stages involve more intense technical rounds, often with senior traders, and sometimes a Superday or on-site visit. Throughout these rounds, you will be asked to solve problems live. The interviewers will often "nudge" you—offering hints or asking follow-up questions to see how you respond to new information. This is a deliberate attempt to see if you can adjust your strategy based on feedback, a core skill for any trader.

The timeline shows a progression from high-volume quantitative screening to high-touch, interpersonal technical evaluation. Candidates should treat each stage as an opportunity to demonstrate not just "correctness," but a structured, logical approach to solving complex problems.

Probability and Expected Value

This is the primary filter for the Quantitative Trader role. Interviewers want to see if you have an intuitive grasp of how to value a bet. You should be able to define the sample space, identify the relevant events, and compute the expectation without getting lost in the arithmetic.

Be ready to go over:

• Conditional Probability – Bayes' Theorem applications.
• Expected Value – Calculating the fair price of a game or security.

As a Quantitative Trader, your day-to-day work centers on the continuous evaluation of market data. You will spend your time analyzing trading strategies, refining models, and communicating with other team members to ensure the firm's positions are well-hedged.

You will collaborate closely with Quantitative Researchers and Developers to automate parts of your trading strategy. You are not just a "trader" in the traditional sense; you are a decision-maker who builds systems and tools to gain an edge. Your deliverables include backtesting strategies, monitoring live trading performance, and participating in the firm’s ongoing educational initiatives—which are a major part of the culture.

A strong candidate for Quantitative Trader at Susquehanna International Group possesses a high level of mathematical fluency and a competitive, analytical mindset.

• Must-have skills:
  • Proficiency in probability theory and statistics.
  • Strong mental math capabilities.
  • Ability to communicate complex logic clearly and concisely under pressure.
  • A logical, structured approach to problem-solving.
• Nice-to-have skills:
  • Experience with coding (Python, C++, or R) for data analysis and backtesting.
  • A background in competitive gaming (e.g., poker, chess, or strategy games).
  • Prior exposure to financial markets, though not strictly required if your math and reasoning skills are elite.

Q: How long should I spend preparing? A: Most successful candidates spend several weeks drilling probability and brainteasers. Focus on speed and accuracy.

Q: Is the coding portion difficult? A: No, it is generally not the focus. Expect light scripting or data analysis tasks rather than deep algorithmic complexity.

Q: What is the culture like? A: It is described as collaborative but intensely competitive. The firm values "intellectual honesty"—being able to admit when you are wrong and learning from it.

Q: How long does the process take? A: It can vary significantly, ranging from a few weeks to several months depending on the recruitment cycle and headcount.

• Talk through your logic: Never sit in silence while solving a problem. The interviewer is assessing your thought process, not just your ability to hit the right number.
• Practice your "Why SIG": Be ready to articulate why you want to trade and why specifically at this firm. Mentioning their culture of learning and their focus on game theory is usually well-received.
• Stay calm under pressure: If you get stuck, ask clarifying questions. Showing that you can handle a "bad hand" is part of the test.
• Brush up on your resume: Be prepared to discuss any project or experience that involved data analysis or complex problem-solving.

The Quantitative Trader position at Susquehanna International Group is one of the most rewarding and challenging roles in the industry. It demands a rare combination of mathematical intuition, competitive drive, and the ability to think clearly under extreme pressure. By mastering probability, refining your mental math, and embracing the firm’s unique culture of decision science, you can significantly increase your chances of success.

Candidates can explore additional interview insights, practice questions, and preparation resources on Dataford. Remember that every interview is a chance to refine your approach; stay confident and keep practicing.

The compensation data provided represents the typical range for this role, encompassing base salary, performance-based bonuses, and potential equity or other benefits. Candidates should interpret these figures as a baseline, keeping in mind that total compensation is heavily tied to individual performance and the firm’s overall success in the markets.