{"id":944051,"url":"https://alion.io/job/old-mission-python-software-engineer","title":"Python Software Engineer","company":{"id":678384,"name":"Old Mission","domain":"oldmissioncapital.com","url":"https://alion.io/company/oldmissioncapital","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":71,"open_postings":27,"ghost_share":0.481,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-14T06:34:16Z"}},"role":"Backend","role_family":"Backend","seniority":"middle","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":66000,"max_usd":147000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":25},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Linux","optional":false},{"name":"MySQL","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-03-30T15:39:57Z","employer_posted_date":"2026-07-09","last_verified_at":"2026-10-14T16:48:25Z","board_verified":true,"closed_at":null,"days_open":198,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":197},"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.\nAbout the Position\nWe 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.\nRequired Skills\nBachelor's degree in Computer Science, Mathematics, or a related Engineering/Science discipline\nA minimum of 3 years of professional Python experience in a production environment\nHigh proficiency in Python on Linux Platforms\nFamiliarity with relational databases (e.g. PostgreSQL, MySQL, etc.)\nExceptional written and verbal communication skills\nA collaborative team player with a knack for owning and driving exciting projects\nThrives in a fast-paced work environment, showcasing effective problem-solving abilities\nBenefits and Perks \nCompetitive salary with discretionary annual bonus\nFully paid private medical, dental, vision with extended coverage and life insurance\nRobust Pension Scheme, income protection, and salary exchange\nFully stocked kitchen and free on-site lunch daily\nSeason Ticket Loan Scheme\nTuition Reimbursement Program\nCycle to Work Scheme \nOld Mission is not accepting unsolicited resumes from any staffing/search firms. 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