Senior Quantitative Developer

Location: Chicago, IL or New York, NY

Base Salary Range: $200,000 - $275,000

(Base salary is only one part of Group One Trading's total compensation, which includes an annual discretionary bonus.)

Our Senior Quantitative Developers work directly with traders and quantitative researchers to build and improve the pricing, strategy, risk, and execution systems that power our options market-making business. They combine academic ideas with a pragmatic understanding of trader approach and intuition, to deliver critical systems from initial design through deployment and shape the strategic direction of the firm.

Our production environment is primarily heavily-optimized C#, with C++ integrated into especially performance-sensitive components. We value demonstrated engineering ability over experience with a particular language, and we embrace agentic AI workflows as a valuable asset to our engineering approach.

Our ideal Senior Quantitative Developer possesses the following:

• Strong quantitative and analytical skills, including familiarity with probability, statistics, numerical methods, and the evaluation of model or strategy behavior
• Knowledge of options pricing models, implied volatility surfaces, risk measurements, and market microstructure
• Demonstrated ability to work directly with traders and quantitative researchers
• Substantial professional software development experience throughout the full software development lifecycle, including requirements analysis, architecture, implementation, testing, deployment, monitoring, and production support
• Ability to lead technical design discussions, make pragmatic architectural decisions, mentor other developers, and improve engineering standards across the team
• Strong written and verbal communication skills, including the ability to explain complex technical and quantitative concepts
• A bachelor's degree in computer science, engineering, mathematics, statistics, or related quantitative fields, or equivalent practical experience

Are you equally comfortable discussing a strategy with a trader, analyzing unexpected model behavior, and diagnosing a production performance issue? Do you take ownership of systems after they are deployed? Can you raise the technical standard of a team while continuing to write and deliver high-quality code? If yes, you may be a strong fit for this Senior Quantitative Developer position.