SIG candidates in 2024 and 2025 describe two different loops. Traders take a probability-heavy online test, a recruiter call, one or two technical interviews with probability, expected value and options questions, and a Super Day of games; software developers take a coding OA, a recruiter call, a 60-90 minute data structures interview, and a final day of object-oriented design, behavioral questions and team-matching technicals. Reported trading questions covered Bayes’ theorem, the law of total probability, expectation and valuing an option; developer questions covered standard DSA, optimizing a given piece of code and OOP design.
Public reports for SIG are thinner than for other trading firms, and most are short Glassdoor entries. Experiences ranged from “pleasant” to one candidate’s “worst interviewing experience,” so treat any single report with care.
Susquehanna interview process round by round
| Round | Trading | Software developer |
|---|---|---|
| Online test | Mettl problem-solving test on probability, EV, combinatorics, logic | Coding OA (CodeSignal in one report) |
| Recruiter call | Resume, why SIG, markets, a surprise probability question | Resume and motivation |
| Technical interview | 60 min with a senior trader: probability, EV, Markov chains, options | 60-90 min: DSA, trade-offs, or optimizing given code |
| Final / Super Day | EV games, market quoting, group bidding game, HR | Onsite technical plus 3-4 team-matching technicals; OOP and behavioral |
Susquehanna interview reports from 2024-2025
These come from Glassdoor reviews and prep-site summaries. Each is one candidate’s account; Glassdoor entries are brief.
- Quantitative trader (December 2024). Three probability-focused questions on Bayes’ theorem, the law of total probability and expectation.
- Software developer, Dublin (March 2025). About a week end to end; the candidate called it pleasant and the conversation good.
- Graduate quantitative trader, Sydney (posting). SIG’s Sydney graduate posting lists the stages itself: an online assessment of quantitative and problem-solving skills, phone interviews (behavioral and technical), and an office interview with a trader that includes a trading floor visit and office tour.
- Software developer, Sydney (July 2025). About four weeks. Reviewers from Sydney described fairly standard DSA problems that simulated real project work; another Sydney candidate called the technical interview very tough and said the design round focused on application code rather than a whole system.
- Trader, Chicago (August 2025). About five weeks. Options trading questions built on different probabilities; another Chicago reviewer was asked to value an option.
- Trader, Dublin (October 2025). The candidate noted you can choose to solve a problem first and then explain, or explain while solving.
- Software developer, Philadelphia area (December 2025). Came through a recruiter. Told the next stage was an onsite technical interview followed by three or four team-matching technical interviews, all on the same day.
Detailed interview experiences
Experience 1: Quantitative trader, probability round (December 2024)
Profile: Trading candidate.
Technical interview: Three probability questions. One leaned on Bayes’ theorem (updating a belief after an observation), one on the law of total probability (splitting a problem into cases), and one on expectation.
Takeaways
- What decided it: Setting up conditional probability cleanly before calculating.
- How to practice: For each problem, write the cases and their probabilities first, then the formula. Practice saying the setup out loud in under a minute.
Experience 2: Trader, Chicago, options questions (2025)
Profile: Trading candidates in SIG’s Chicago office, where one reported a five-week process.
What they were asked: Options trading questions built on different probabilities, and in another review, finding the value of an option.
Takeaways
- What decided it: Translating a probability setup into a payoff and its expected value.
- How to practice: Price simple binary and call payoffs on dice or coin outcomes; review put-call parity.
Experience 3: Trading candidate, games-heavy loop (2025)
Profile: Trading candidate who described a loop with “lots of games.”
What happened: Many games, plus technical questions involving data analysis, probability and expected value.
Takeaway: Expect to play, not only to calculate. Practice explaining each move in a game in expected value terms as you make it.
Experience 4: Software developer, Sydney (2025)
Profile: Graduate and intern software development candidates.
What happened: Reviewers described standard DSA problems that felt close to real project work. One candidate found the technical interview very tough; another noted the design round looked only at the application code, not a full system architecture. A third stressed that how you communicate, explain in real time and show your values matters a lot.
Takeaways
- Common fail: Treating the design round as large-scale system design when SIG wanted class-level design.
- How to practice: Design small applications with clear classes and interfaces, and explain each choice while coding.
Experience 5: Software developer, US finals (2025)
Profiles: US software developer candidates, including a December 2025 recruiter-sourced candidate near Philadelphia.
What happened: One reviewer had a 90-minute technical interview that was well structured: DSA and explaining trade-offs. Another was given existing code and 30 minutes to optimize it, which came down to using hash maps. A final round included coding, probability questions and behavioral questions, and the December 2025 candidate was told the final day pairs an onsite technical interview with three or four team-matching technical interviews.
Takeaways
- Common fail: Skipping probability prep as a developer; it appears in some SIG developer finals.
- How to practice: Read and speed up unfamiliar code under a 30-minute timer, then do a long day of four or five back-to-back technicals.
Susquehanna interview questions that come up often
Trading
- Bayes’ theorem and the law of total probability
- Expected value of dice, card and coin games
- Valuing an option; options questions built on probabilities
- Market making on an uncertain quantity
- Gambler’s ruin, random walks and path counting (assessment)
Software developer
- Standard data structures and algorithms with trade-offs
- Optimize a given piece of code (hash maps)
- Object-oriented design of an application
- Count occurrences of digits 0, 1 and 4 from 0 to n (a two-hour exercise reported by TraderMath)
Behavioral
- Why trading? Why SIG?
- What is your edge?
- Weaknesses
SIG behavioral questions in these reports
Trading candidates get behavioral questions on the recruiter call and in a 30-minute Super Day HR interview; developers get them in the final round. Sample answers tied to SIG’s six core values are on the Susquehanna behavioral interview questions page. The full process, pay and worked probability answers are on the Susquehanna interview questions page.
Susquehanna interview tips from these reports
Trading rounds
- Probability and expected value in every round, including the recruiter call.
- Options questions appeared in Chicago in 2025.
Developer rounds
- Standard DSA plus class-level design, not large-scale system design.
- Some finals add probability questions.
Communication
- You may solve first and explain after, or explain as you go; pick one and be clear.
- Real-time explanation was called very important by a Sydney candidate.
Sources
- TraderMath: SIG interview guide (trading track, digit-counting exercise)
- SIG: about Susquehanna
- Glassdoor SIG interview reviews: December 2024 (trader), March 2025 (Dublin software developer), July 2025 (Sydney), August 2025 (Chicago), October 2025 (Dublin), December 2025 (Philadelphia), plus undated 2025 software developer and trader entries
- SIG Sydney graduate quantitative trader posting (process stages), as listed on TraderMath’s job board
- Dataford: SIG software engineer interview experiences (CodeSignal OA report)
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