Verified by our engine · Posted +6mo ago

Old Mission Capital

Python Software Engineer

Old Mission Capital · Technology

London

Mid-level Still listed after 6+ months

SoftwarePythonLinuxMySQLPostgreSQL

Last seen 1h ago

Posted
+6mo ago

Posted on 30 March 2026

Workplace
On-site

Work model: On-site

Salary
Not disclosed

Salary range not shared by the company

Visa sponsorship
Not specified

Visa sponsorship details unknown

Listing history No signals observed

First seen 26 Oct 2026. Last checked 2 Nov, 22:17 UTC. We read each employer's own career page on a cycle and record what changes; this is what we observed, not a verdict on the role.

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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 on the lookout for Software Engineers who excel in Python. As a Software Engineer, you'll play a pivotal role on your team, taking ownership of cutting-edge projects. Your primary responsibilities will encompass the refinement and advancement of our trading systems and mission-critical applications. Additionally, you'll collaborate closely with quants, traders, and research teams to bolster our systems' adaptability and scalability, all while contributing to the development of innovative trading applications.

Required Skills

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

- A minimum of 3 years of professional Python experience in a production environment

- High proficiency in Python on Linux Platforms

- Familiarity with relational databases (e.g. PostgreSQL, MySQL, etc.)

- 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 

- Competitive salary with discretionary annual bonus

- Fully paid private medical, dental, vision with extended coverage and life insurance

- Robust Pension Scheme, income protection, and salary exchange

- Fully stocked kitchen and free on-site lunch daily

- Season Ticket Loan Scheme

- Tuition Reimbursement Program

- Cycle to Work Scheme 

 

 

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.

About Old Mission Capital

Old Mission Capital is a Chicago proprietary trading firm with a London office. The European board is small — a few quant and software roles at a time — and the work is trading systems rather than product engineering.

Apply at Old Mission Capital