{"id":3695751,"url":"https://alion.io/job/chaos-industries-senior-backend-software-engineer-python-fastapi","title":"Senior Backend Software Engineer (Python / FastAPI)","company":{"id":449716,"name":"CHAOS Industries","domain":"chaosinc.com","url":"https://alion.io/company/chaos-industries","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":84,"open_postings":11,"ghost_share":0,"stale_share":0.455,"repost_share":0,"time_to_fill_p50_days":60,"computed_at":"2026-11-04T06:34:25Z"}},"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":["San Francisco, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":240000,"currency":"USD","period":"year","gross":null,"usd_annual":240000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"FastAPI","optional":false},{"name":"Python","optional":false},{"name":"Time Series","optional":false},{"name":"WebSockets","optional":false},{"name":"Azure","optional":true},{"name":"TypeScript","optional":true}],"status":"live","first_seen_at":"2026-11-03T14:43:21Z","employer_posted_date":"2026-11-03","last_verified_at":"2026-11-04T08:53:43Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Senior Backend Software Engineer (Python / FastAPI)\nSan Francisco, CA (On-site) | $140k-$240k base + pre-IPO stock options\nBuild the real-time backend that turns radar sensor data into decisions people can act on.\nCHAOS Industries is a defense tech company founded in 2022 that has raised $1B from investors including 8VC, Accel and Valor Equity Partners. You’ll own the backend services and data pipelines that move sensor data from radars in the field to the operators who depend on it.\nWhat you’ll do\nBuild high-performance Python services that ingest, process and distribute real-time sensor data with low latency, high reliability and security at scale\nBuild high-performance Python (FastAPI) services that ingest, process and distribute real-time data securely at scale\nOwn streaming, storage and replay of detections, tracks and telemetry for live and playback 3D geospatial views\nBuild the decision layer that coordinates a growing fleet of sensors as field conditions change\nShape platform architecture for new capabilities, scale and long-term maintainability\nYou’re a fit if you have\nStrong production experience building backend services in Python (FastAPI or similar)\nBuilt real-time or streaming data systems: message queues, WebSockets, time-series data\nOwned a production system end to end: designed it, shipped it, fixed it when it broke\nReal leverage from AI coding tools, with a considered view on what to delegate and what not to\nBased in, or willing to relocate to, the San Francisco Bay Area (this role is on-site)\nNice to have\nGeospatial or 3D data visualization in TypeScript and React\nEdge computing, or moving data reliably over constrained or unreliable networks\nAzure or another major cloud platform\nHardware, sensors, robotics, telemetry or defense systems\nWhat you get\nMedical, dental and vision, 100% paid by the company\n401k with 50% company match up to 6% of pay, plus FSA, HSA and life insurance\nPre-IPO stock options, relocation assistance, and annual bonuses (coming soon)\nUnlimited PTO and a casual dress code\nFree daily lunch while you’re working on-site, plus a fully stocked kitchen\nPay range shown is base salary only and excludes equity, bonuses and benefits. Actual offers vary based on experience, skills and business needs.\nPlease note: Must be a U.S. Person as defined under U.S. export control regulations, as required for access to controlled technology, and able to obtain and maintain a U.S. security clearance.\nApply now. It takes just 2 minutes.","description_format":"text","description_chars":2497,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":true,"languages":[]},"benefits":["401k plan","Annual bonuses","Equity","Life insurance","Relocation assistance","Stock options","Unlimited PTO"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":true,"industries":["C4ISR","Defense Manufacturing"],"lifecycle":[{"event":"open","at":"2026-11-03T17:58:45Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":0,"expected_fill_days":60,"reasons":["conf:2","velocity","win:early","comp:brand"],"computed_at":"2026-11-04T06:34:25Z"},"pay":{"stated_usd_annual":240000,"is_top_pay":true},"html_url":"https://alion.io/job/chaos-industries-senior-backend-software-engineer-python-fastapi","json_url":"https://alion.io/job/chaos-industries-senior-backend-software-engineer-python-fastapi.json","meta":{"generated_at":"2026-11-04T09:54:31Z","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":15368,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-05T00:00:00Z"}},"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":449716},"rest":"https://alion.io/mcp/rest/get_company?id=449716"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fchaos-industries-senior-backend-software-engineer-python-fastapi"},{"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%2Fchaos-industries-senior-backend-software-engineer-python-fastapi"},{"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%2Fchaos-industries-senior-backend-software-engineer-python-fastapi"},{"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/chaos-industries-senior-backend-software-engineer-python-fastapi\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fchaos-industries-senior-backend-software-engineer-python-fastapi"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3695751}},{"tool":"search_jobs","arguments":{"company":"chaosinc.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3695751},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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