How Susquehanna (SIG) Interviews in 2026: Process, Questions & What They Score

• You flip a coin repeatedly until you get two heads in a row. What is the expected number of flips? (verified as a recurring SIG-attributed question across multiple sources; answer is 6)
• If the probability of seeing at least one hawk in one hour is 0.8, what is the probability of seeing at least one hawk in half an hour? (widely reported and independently corroborated as a SIG question, sometimes phrased with shooting stars instead of hawks)
• You're offered a bet: pay $10 to play; partway through, the interviewer offers to double the bet to $20. What minimum win probability would make it correct to accept the double?
• Two-coin/Bayes' theorem style problem: given a coin might be fair or biased, update your probability estimate after observing a sequence of flips.
• Standard expected-value problems involving drawing cards, rolling dice, or picking balls from an urn under various payoff rules.
• Solve a linear system, single-variable calculus, or combinatorics problem quickly under time pressure (recurring format in the online assessment).

• Make me a market (bid/ask) on the number of dominoes in a standard domino set (a well-documented, specifically SIG-attributed classic).
• In a market-making card or dice game, quote a two-sided price on an unknown outcome and manage your resulting position as new information (cards) is revealed.
• In a poker hand where you have roughly a 30% chance of winning, the pot is $100 and your opponent bets $50. Do you call? Justify with pot odds/EV (corroborated as a SIG-specific example).
• General 'walk me through your decision-making' prompts after a hand or game outcome, probing whether you can reason about EV, edge, and information rather than just the result.
• Group market-making exercises during the Superday where multiple candidates trade against each other on a synthetic asset.

• Estimate a Fermi-style quantity, e.g., how many AAA batteries are sold in the UK each year (independently corroborated as a SIG-used Fermi question).
• Grid path-finding or optimization puzzles (e.g., counting distinct paths or optimal routes under constraints).
• Rapid mental-arithmetic drills under time pressure as part of the timed online assessment.
• Logic puzzles involving weighing, sequencing, or deduction with limited information.

• Solve an algorithmic problem such as computing maximum drawdown or compound interest over a data series.
• Implement an object-oriented design task from scratch, e.g., a library-style class with filtering/search methods, then extend it with new requirements live.
• Given an existing piece of code, optimize it for time/space complexity and refactor for readability/SOLID principles, then explain your changes.
• Medium-to-hard LeetCode-style problems involving 2D arrays/matrices, trees, graphs, or linked lists (commonly delivered via CodeSignal or Codility).
• System-design discussion: design a real-time market-data feed or an order-book matching engine, covering data storage, APIs, low-latency constraints, and edge cases (independently corroborated as a recurring SIG system-design theme).
• Explain a past project in technical depth (a 'project deep-dive' segment is a recurring Superday component).

• Why do you want to work at SIG, and why trading/this role specifically?
• Tell me about a time you had to handle a difficult team member or disagreement.
• How would you describe yourself in three words?
• What is your greatest weakness?
• Do you have competing offers, and what are your visa/sponsorship needs? (typically asked by the recruiter, not the technical interviewer)
• Describe your work style and how you'd fit into a small, collaborative team.
• What competitive or strategic activities have you pursued (sports, chess, poker, quant competitions), and what did you learn from them?

Susquehanna (SIG)'s process has 6 stages, in order: Application / Resume Screen, Online Assessment, Recruiter / HR Phone Screen, First-Round Technical / Video Interview, Superday / Final Onsite (or virtual onsite), Final Decision / Offer.

Susquehanna (SIG) evaluates candidates against No formal named leadership-principles-style scoring rubric is publicly documented for SIG interviews: Good Decision Making: 'We take a rigorous and analytical approach to decision making. Becoming a good decision maker requires reflection and practice.' (sig.com/who-we-are), Teamwork: 'We believe that smart people working together always come up with a better solution than the lone genius.', Belonging: 'Susquehanna fosters a culture of collaboration that encourages every employee to feel welcome and comfortable.', Growth Mindset: 'We are constantly learning and challenging ourselves to grow. Our commitment to development and hard work drives our success.', Expertise: 'We value the expertise of the people we hire. We provide an environment where each individual can have a meaningful impact.', Integrity: 'Dependability and honesty are the foundation of our relationships. Our high level of respect for each other and our work is at the core of our culture and success.'.

Susquehanna (SIG)'s question bank spans 5 categories: Probability & Expected-Value Reasoning (core to trading-track interviews); Market-Making, Poker & Game-Theory Exercises (trading-track, often in the Superday); Brainteasers & Mental Math / Estimation; Coding & System Design (software engineer / quant developer track); Behavioral & Cultural Fit.

This playbook is high confidence, compiled from 18 public sources, and last verified July 7, 2026. It describes one well-documented shape of Susquehanna (SIG)'s interviews, not a guarantee of what any individual loop will look like.