{"id":3839179,"url":"https://alion.io/job/flow-engineering-staff-software-engineer-security-2","title":"Staff Software Engineer - Security","company":{"id":673245,"name":"Flow Engineering","domain":"flowengineering.com","url":"https://alion.io/company/flow-engineering","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":82,"open_postings":12,"ghost_share":0,"stale_share":0.917,"repost_share":0,"time_to_fill_p50_days":12,"computed_at":"2026-11-06T05:58:05Z"}},"role":"Backend","role_family":"Backend","seniority":"staff","employment_type":"full_time","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":{"min":160000,"max":230000,"currency":"GBP","period":"year","gross":null,"usd_annual":309852},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"CI/CD","optional":false},{"name":"FedRAMP","optional":false},{"name":"GCP","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"SOC 2","optional":false},{"name":"Threat Modeling","optional":false},{"name":"JavaScript","optional":true},{"name":"LLM","optional":true},{"name":"Node JS","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Python","optional":true},{"name":"TypeScript","optional":true}],"status":"live","first_seen_at":"2026-11-05T17:27:25Z","employer_posted_date":"2026-11-05","last_verified_at":"2026-11-07T01:15:16Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"About Flow\nFlow Engineering is an AI-native requirements platform for modern engineering organizations, enabling hardware teams to collaborate with AI agents to design, validate, and evolve complex systems with speed and rigor.\nAbout the role\nOur customers in defense, aerospace and more trust us with sensitive systems requirements. That means security is a first-order part of the product, so we’re looking for a Staff Software Engineer to own it.\nThis is our first dedicated security hire, so you'll define the security architecture, harden the platform, and build out the compliance posture. Since LLMs and agentic workflows sit at the center of what we do, you'll also lead how we secure them.\nWhat you'll do\nOwn security architecture across the platform: threat modeling, secure design reviews, and the standards we build against.\n\nHarden the full stack, from application security to cloud infrastructure (identity, network, secrets), tenant isolation, and data protection.\n\nDrive SOC 2 and get us ready for the certifications defense and aerospace customers ask about, including export control and ITAR.\n\nSecure our AI and agentic systems: prompt injection, data leaking through models, what actions agents are allowed to take, and guardrails.\n\nBuild the security tooling we need across detection, monitoring, vulnerability management, and CI/CD.\n\nStand up incident response and run it, from detection through postmortems.\n\nWork with sales and product to get through security reviews and win customer confidence.\n\nAbout you\n8+ years building production software, including running secure services at scale in the cloud.\n\nDeep experience in application and cloud security (AWS, GCP, or Azure): identity and access, secrets, network security, data protection.\n\nYou've owned security in a regulated or high-trust environment and have implemented SOC 2 yourself. Export control, ITAR, or FedRAMP experience is a big plus.\n\nSolid on threat modeling, secure architecture, and incident response.\n\nYou've secured AI or LLM systems.\n\nYou're comfortable being the security lead at a startup and setting the agenda yourself.\n\nOur stack (AI-leaning)\nTypeScript/Node.js and Python for AI and backend services.\n\nModern LLM APIs and orchestration libraries for building agentic workflows.\n\nPostgres and other managed cloud services for data and state.\n\nHow we work & values\nSpeed over everything: prototype AI workflows quickly, then harden what works.\n\nOwn, downscope, ship, iterate: one clear owner per feature, from prototype to production.\n\nFundamentals done well: evaluation, observability, and safety are part of the first version, not an afterthought.\n\nCompetitive salary and meaningful equity.\n\nHealth, dental, and vision coverage.\n\nFlexible time off and support for experimentation, learning, and staying current with the AI ecosystem.","description_format":"text","description_chars":2836,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":true,"languages":[]},"benefits":["Equity","Flexible time off"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["CAD, PLM & BIM Software","Manufacturing & Industrial Software"],"lifecycle":[{"event":"open","at":"2026-11-05T22:03:39Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":0,"expected_fill_days":12,"reasons":["conf:3","stale_co","velocity","win:early"],"computed_at":"2026-11-06T05:58:05Z"},"pay":{"stated_usd_annual":309852,"is_top_pay":true},"html_url":"https://alion.io/job/flow-engineering-staff-software-engineer-security-2","json_url":"https://alion.io/job/flow-engineering-staff-software-engineer-security-2.json","meta":{"generated_at":"2026-11-07T02:58:46Z","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":7138,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-08T00:00:00Z"}},"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":673245},"rest":"https://alion.io/mcp/rest/get_company?id=673245"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fflow-engineering-staff-software-engineer-security-2"},{"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%2Fflow-engineering-staff-software-engineer-security-2"},{"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%2Fflow-engineering-staff-software-engineer-security-2"},{"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/flow-engineering-staff-software-engineer-security-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fflow-engineering-staff-software-engineer-security-2"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3839179}},{"tool":"search_jobs","arguments":{"company":"flowengineering.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3839179},"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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