Senior Quantitative Developer

PortalPlayer, Inc.; Chicago (IL); On-site; USD 200,000 - 275,000; Full time

Benefits offered by this job

401(k) with employer matching

Paid holidays

Generous vacation

Parental leave

Flexible spending accounts (FSA)

Job summary

Group One Trading seeks a Senior Quantitative Developer to join its options market-making team in Chicago or New York. You will design, implement, and optimize pricing, risk, and execution systems, collaborating closely with traders and quantitative researchers to deliver robust, high-performance solutions.

You will own meaningful components, lead technical discussions, and mentor peers, emphasizing C++ and C# in a fast-paced, production environment.

Qualifications

• Strong quantitative and analytical skills with probability and statistics
• Knowledge of options pricing models, implied vol surfaces, risk measures
• Ability to work directly with traders and researchers
• Broad software development lifecycle experience from requirements to production
• Lead technical design discussions and mentor developers
• Strong written and verbal communication skills
• Bachelor's degree or equivalent in quantitative field

Responsibilities

• Build and improve pricing, strategy, risk, and execution systems for options market-making
• Collaborate with traders and researchers to deploy critical systems
• Lead design discussions and raise engineering standards
• Own end-to-end components and improve performance and maintainability
• Mentor other developers and contribute to tooling and processes
• Explain complex concepts clearly to non-technical stakeholders

Skills

Quantitative analysis

Options pricing

Communication with traders

Software development lifecycle

Mentoring

C++/C# programming

Education

Bachelor's degree in CS/Engineering/Math/Statistics

Tools

C++

C#

Job description

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.)

THE OPPORTUNITY

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.

The Skillset

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.

What To Expect As a Senior Quantitative Developer

Within 1 month

You will complete your initial orientation and begin developing a working understanding of our options market-making business, trading strategies, quantitative research process, and production technology environment. You will become familiar with our codebases, historical and real-time data, system architecture, deployment processes, monitoring tools, and risk controls. You will build working relationships with traders, quantitative researchers, developers, and infrastructure engineers, begin participating in technical design and code reviews, and make initial contributions to the production system.

Within 3 months

You will take end-to-end ownership of a meaningful strategy, research, pricing, risk, or trading-system enhancement. You will work directly with developers and quantitative researchers to refine the problem, identify appropriate success criteria, and implement the solution. You will validate your work in non-production testing environments. You will coordinate deployment of your changes with appropriate monitoring and controls, participate effectively in production support, and begin identifying opportunities to improve system performance and maintainability. You will study for and pass the FINRA Series 57 exam, enabling you to independently lead projects that directly impact trading decisions.

Within 6 months

You will be a trusted technical owner for one or more important components of the trading platform. You will independently lead complex projects from initial concept through production operation, make informed architectural and performance tradeoffs, and deliver measurable improvements in trading capability, computational performance, or research productivity. You will proactively address technical debt and operational risk, improve testing and observability, mentor other developers, and help establish engineering practices that allow the team to move quickly without compromising correctness. Your growing understanding of our markets and trading systems will enable you to contribute to the identification and evaluation of new technical and quantitative opportunities.

The Benefits

Our Senior Quantitative Developer earns 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.

Salary: $200000 - $275000 per year