Software Engineer

Old Mission Capital
Chicago, Illinois, United StatesFull-timePosted Sep 18, 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

Old Mission is seeking a highly skilled Software Engineer to join our Research Infrastructure team. The team is responsible for managing and maintaining datasets, infrastructure, and libraries that power the firm's research activities across a huge number of instruments in nearly all asset classes - a vast data universe of Equities, Options, Commodities, Bonds, and more. Our day to day consists of handling production issues, developing new datasets, building next-generation infrastructure, and maintaining our data pipelines. This person will sit in our Chicago office.

Responsibilities:

The complexity of data sources presents unique engineering challenges that require innovative solutions that you will help create

You will be responsible for designing, building, and maintaining data pipelines and data infrastructure

You will help capture, archive, store, and index data for the entire firm

You will design and implement big data tooling to support cluster computing and high-throughput computing tasks

You will work on solving problems relating to how data is transmitted between C++ and Python

Re-architect current APIs to ensure scalability and performance improvements

Collaborate in the release process, including rolling out new releases, debugging and maintenance of systems

Identify and implement strategies for upgrading the current data storage capacity

Use a combination of technical expertise and analytical skills to ensure the efficient and effective functioning of our data infrastructure

Focus on solving tough problems using research and data and spend time solving these problems utilizing modern technologies

Required Skills

Experience with C++ (required) and Python (preferred)

4+ years of experience as a Systems Engineer, Platform Engineer, Data Engineer, Software Engineer, or similar - "Big Data" experience preferred

Ability to drive and lead technical projects as well as mentor junior engineers

Knowledge of software engineering practices - what makes code reusable and extensible

Passion for infrastructure: building internal tooling and frameworks

Experience with the design and implement big data tooling to support cluster computing and high-throughput computing tasks is a plus

Experience with Linux APIs – filesystems, networking, processes management, etc.

Experience developing big data technology, preferably complete rebuilds is a plus

Bachelor's degree in Computer Science or a related field

Benefits and Perks

Competitive salary with discretionary annual bonus

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

Base Salary Range

$175,000 - $300,000 - 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 be responsible for designing, building, and maintaining data pipelines and infrastructure to support the firm's research activities.
  • This includes re-architecting APIs for scalability and solving complex data transmission problems between C++ and Python.

Qualifications

  • The role requires 4+ years of experience in software or data engineering with strong proficiency in C++.
  • A bachelor's degree in Computer Science or a related field is also 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

C++PythonData EngineeringData PipelinesLinuxDistributed SystemsSystem DesignPerformance OptimizationDebuggingConcurrency

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

H-1B sponsorship history

Historical employer filing data was found for Old Mission Capital. The employer record includes 29 historical certified applications. This is employer-level history, not a guarantee that this role currently offers sponsorship.