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Python Software Engineer

Old Mission
CompanyOld Mission
CategoryEngineering
LocationLondon
RemoteOn-site (inferred)
EmploymentNot stated
LevelNot stated
SalaryNot stated by the employer
Posted30 Mar 2026
Last verified30 Jul 2026
SourceEmployer career page (greenhouse)
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Description
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. Old Mission does not seek capital from outside investors, allowing us the flexibility to aggressively invest in our team members and keep them engaged in the firm’s growth. 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.
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