{"id":944039,"url":"https://alion.io/job/old-mission-senior-python-software-engineer","title":"Senior 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":70,"open_postings":26,"ghost_share":0.5,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":145000,"max_usd":266000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":3030},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"Linux","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-05-05T14:54:18Z","employer_posted_date":"2026-09-21","last_verified_at":"2026-10-13T09:03:41Z","board_verified":true,"closed_at":null,"days_open":160,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":160},"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 actively hiring a Senior Python Software Engineer with a passion for building reliable systems at scale. This role involves developing and supporting execution platforms, real-time trader-facing applications integrated with our trading systems, large-scale data and research systems, and automation of trader workflows. You will bring proven expertise in Python to distributed systems supporting global trading across the firm. \nRequired Skills\nBachelor's degree in Computer Science, Mathematics, or a related Engineering/Science discipline\nA minimum of 5 years of professional Python experience in a production environment\nHigh proficiency in Python on Linux Platforms\nFamiliarity with relational databases and/or enterprise messaging/object storage (Kafka, Ceph, Iceberg) \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 \nFully paid Medical, Dental, Vision, Disability, and Life Insurance\nFully stocked kitchen; free breakfast and lunch every day on-site\nTuition Reimbursement Program\n401(k) with employer match\nPaid Vacation, Sick, and Parental leaves\nCommuter and Flexible Spending Programs\nIn office M-F with 10 remote days per year\nBase Salary Range \n$200,000 - $250,000 - 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. \nOld 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.","description_format":"text","description_chars":2389,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Life insurance","Parental leave"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Hedge Funds & Alternative Investments"],"lifecycle":[{"event":"open","at":"2026-09-15T19:46:41Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 3 · green card filings: 3","filings_12m":3,"filings_prev_12m":6,"green_card_filings_12m":3,"median_offered_wage_usd":177500,"route":null,"cap_exempt":false,"checked_at":"2026-10-03T21:08:04+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)","US Department of Labor: PERM disclosure data (green cards)"],"filings_for_role_12m":3}],"liveness":{"score":5,"band":"cold","label":"Long shot","p_open":1,"p_active":0.185,"p_room":0.28,"age_days":160,"expected_fill_days":22,"reasons":["conf:0","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-13T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/old-mission-senior-python-software-engineer","json_url":"https://alion.io/job/old-mission-senior-python-software-engineer.json","meta":{"generated_at":"2026-10-13T09:13:51Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":13820,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":678384},"rest":"https://alion.io/mcp/rest/get_company?id=678384"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fold-mission-senior-python-software-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fold-mission-senior-python-software-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fold-mission-senior-python-software-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/old-mission-senior-python-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fold-mission-senior-python-software-engineer"}]}