Jobs at Old Mission

10 open positions at Old Mission — Chicago, Illinois (inferred from industry and context, but not explicitly stated on the page). Updated October 2026.

Old Mission currently has 10 open roles (on-site). Hiring locations include Chicago, IL, United States, New York, NY, United States, London.

Location: Chicago, Illinois (inferred from industry and context, but not explicitly stated on the page)
Website: https://www.oldmissioncapital.com
Open roles: 10

About Old Mission

Old Mission is a global quantitative market-making firm founded in 2008. We build and operate a proprietary trading platform that dynamically values individual securities and complex derivatives at high speed. Our platform enables us to work with the world's largest exchanges, brokers, and institutional investors as a trusted partner, providing liquidity and risk transfer in a wide range of financial instruments, both on and off exchange. We are a privately held firm with a flat hierarchy, fostering an outwardly competitive culture that values good ideas. Our team of technologists, traders, and operations specialists is dedicated to improving market efficiency through advanced technology, unique liquidity, and an entrepreneurial spirit.

Open Roles at Old Mission

What Old Mission Hires For

Browse Old Mission openings alongside similar roles at other companies:

Data & ML Engineer Jobs (10) Senior & Staff Engineer Jobs (10) Backend Developer Jobs (10) Frontend Developer Jobs (10) Internship & Entry Level Jobs (10) Full Stack Developer Jobs (10)

Open Roles at Old Mission by Category

Python Software Engineer (3) C++ Software Engineer (3) C++ Software Engineer - Research Infrastructure (1) Trading Operations/DevOps Engineer (1) Software Engineer - Post Trade (1) Software Engineer – 2027 Graduate Program (August Start) (1)

Old Mission Jobs by Location

Chicago, IL, United States (6) New York, NY, United States (2) London (2)

Old Mission Jobs by Type

Full-time (8) Unspecified (2)

How to Apply for Jobs at Old Mission

All Old Mission openings listed above are aggregated from the company's official careers channels and updated October 2026. To apply, open any role that matches your profile and use the Apply Now button — it takes you directly to Old Mission's official application page, so your application always goes to the employer itself, with no middleman.

Before applying, tailor your CV to the specific role: mirror the job title, highlight the skills and technologies mentioned in the listing, and quantify your impact where possible. You can also save interesting roles to your JobSeek account to track deadlines and compare offers side by side.

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