Senior Software Engineer

Location: Chicago, IL or New York, NY

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 Software Engineers build and improve the real-time systems that power our options market-making business. They work directly with traders and other technologists to translate complex business and trading requirements into reliable production software, and take ownership of critical systems from initial design through deployment and live operation. This is a hands-on engineering role for someone who can reason deeply about software architecture, performance, and production behavior.

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 Software Engineer possesses the following:

• Substantial professional software development experience throughout the full software development lifecycle, including requirements analysis, architecture, implementation, testing, deployment, monitoring, and production support
• Strong software engineering instincts, treating abstraction, maintainability, testability, observability, and operational reliability as first-class design concerns
• Experience developing real-time, high-throughput software for electronic trading, financial markets, or another performance-sensitive production environment
• 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 concepts to both technical and non-technical stakeholders
• A bachelor's degree in computer science, engineering, or a related discipline, or equivalent practical experience

Are you equally comfortable designing new systems in a distributed architecture, reasoning about performance tradeoffs, and diagnosing difficult production issues? 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 software? If yes, you may be a strong fit for this Senior Software Engineer position.

Our Senior Software Engineers earn a competitive salary, including a performance-based bonus. We provide fantastic benefits, including 401(k) and Roth 401(k) retirement plans with employer matching, medical, dental, vision, generous vacation time, paid holidays, parental leave, and flexible spending accounts (FSA) for health care, dependent daycare, and parking or mass transit expenses.

If this sounds like the right opportunity for you, apply today! Please fill out our initial 3-minute, mobile-friendly application for the Senior Software Engineer role at group1.com/careers. We look forward to meeting you!