Software Engineer

Old Mission Capital
Chicago, Illinois, United StatesFull-timePosted Aug 26, 2026

About the role

Old Mission is a global proprietary trading firm that leverages state-of-the-art technology and research to identify and execute profitable trading strategies across multiple asset classes around the world. Our offices in Chicago, New York, and London are all composed of naturally-curious individuals who thrive in a team environment and constantly strive for improvement.

About the Position

We are actively hiring a Senior Software Engineer with a passion for building reliable systems at scale. As a post-trade developer, you will coordinate solutions across a wide range of inputs, outputs, and latency requirements. You will bring proven expertise in Python and C++ to a distributed system that supports global trading across the entire firm.

Required Skills

Bachelor's degree in Computer Science, Mathematics, or a related Engineering/Science discipline

A minimum of 5 years of professional Python and C++ experience in a production setting

Strong Linux knowledge (e.g. performance tuning, networking)

Comfortable working with relational databases (e.g. PostgreSQL,MySQL, etc.)

FIX experience (e.g. execution management, market data, drop copy)

Exceptional written and verbal communication skills

A collaborative team player with a knack for owning and driving exciting projects

Thrives in a fast-paced work environment, showcasing effective problem-solving abilities

Benefits and Perks

Fully paid Medical, Dental, Vision, Disability, and Life Insurance

Fully stocked kitchen; free breakfast and lunch every day on-site

Tuition Reimbursement Program

401(k) with employer match

Paid Vacation, Sick, and Parental leaves

Commuter and Flexible Spending Programs

In office M-F with 10 remote days per year

Base Salary Range

$200,000 - $250,000 - Salaries are based on numerous factors such as skills, experience, and education. Our compensation package also includes a discretionary bonus and a comprehensive benefits program for full-time employees. For more information, reach out to your recruiter.

Old Mission is not accepting unsolicited resumes from any staffing/search firms. All resumes submitted by staffing/search firms to any employee at Old Mission via-email, the Internet or directly without a valid signed search agreement will be deemed the sole property of Old Mission, and no fee will be paid in the event the candidate is hired by Old Mission.

Responsibilities

  • You will coordinate solutions across a wide range of inputs, outputs, and latency requirements for post-trade systems.
  • You will also contribute to a distributed system that supports global trading across the entire firm.

Qualifications

  • Candidates must have a Bachelor's degree in Computer Science, Mathematics, or a related Engineering/Science discipline.
  • A minimum of 5 years of professional Python and C++ experience in a production setting is required.

Benefits

  • Medical Insurance
  • Dental Insurance
  • Vision Insurance
  • Disability Insurance
  • Life Insurance
  • Free breakfast
  • Free lunch
  • Tuition Reimbursement Program
  • 401(k) with employer match
  • Paid Vacation
  • Sick leave
  • Parental leave
  • Commuter Program
  • Flexible Spending Programs

Skills mentioned

PythonC++LinuxSQLPostgreSQLDistributed SystemsPerformance OptimizationSystem DesignDebuggingTCP/IP

About Old Mission Capital

Old Mission is a global, multi-asset market maker. We specialize in valuing individual securities and complicated derivatives at the speed of modern markets. Our advanced market-making platform allows us to collaborate seamlessly with the world’s largest exchanges, brokers, and institutional investors, providing them with a trusted partner for efficient risk transfer across a diverse range of securities worldwide.

Financial Services201-500 employeesChicago, Illinois