{"id":4258319,"url":"https://alion.io/job/witnessai-staffprincipal-fullstack-software-engineer","title":"Staff/Principal Fullstack Software Engineer","company":{"id":63230,"name":"WitnessAI","domain":"witness.ai","url":"https://alion.io/company/witnessai","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":100,"open_postings":3,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":57,"computed_at":"2026-11-12T10:38:37Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Mountain View, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":216000,"max":274000,"currency":"USD","period":"year","gross":null,"usd_annual":274000},"salary_estimate":null,"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"Go","optional":false},{"name":"GraphQL","optional":false},{"name":"Kubernetes","optional":false},{"name":"LLM","optional":false},{"name":"Node JS","optional":false},{"name":"React Router","optional":false},{"name":"React.js","optional":false},{"name":"Remix","optional":false},{"name":"Rest API","optional":false},{"name":"Rust","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-11-13T13:35:10Z","employer_posted_date":"2026-11-13","last_verified_at":"2026-11-13T14:27:41Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Staff/Principal Fullstack Software Engineer\nLocation: Mountain View, CA | Hybrid, 2 days/week in office\nAbout Us:\nWitnessAI is the unified AI security and governance platform enterprises trust to govern and protect all AI activity. We provide complete, network-level visibility into every interaction including employees and autonomous agents, even in native apps where legacy tools are blind. Unlike security that relies on outdated keywords, our platform understands intent, enabling intelligent policies that stop novel threats like prompt injection while empowering productivity. WitnessAI transforms security from a bottleneck into the enabler of your AI strategy as the confidence layer for enterprise AI.\nThe Role\nThis is a Staff/Principal role with org-wide scope. You’ll work hand in hand with the Head of Product Engineering on technical strategy and help grow the engineers around you. That work centers on our web platform, which customers rely on to see, control, and secure AI activity across their company. You’ll shape its architecture end to end, from the React UI to the Go/Rust services and data stores behind it.\nThis is an individual contributor role, and you’ll be in good company: nobody here has stopped coding. We all ship code every day alongside our AI Agents, which feels fitting to a team whose job is keeping AI in check. You’ll lead technical work across the stack, from the UI to the ingress pipeline and raise the engineering bar through design reviews, mentoring, and the example you set in your own code.\nWhat You'll Do\nArchitecture. Design and own the end-to-end architecture of the product application: frontend, APIs, services, and data model. Write ADRs for the big decisions and see them through to production.\n\nBuild across the stack. Ship features in full-stack TypeScript (React Router), Rust and Go services. Take a feature from a rough idea to a running release.\n\nAPI and data design. Define API contracts and schemas that stay stable as the platform and customer base grow. Own multi-tenant concerns like isolation, performance, and migrations.\n\nPerformance and reliability. Find and fix bottlenecks in page load, query time, and service latency. Set standards for testing, observability, and release safety.\n\nMake complex data usable. Work with product and design to turn dense security and policy data into dashboards and workflows that a busy admin can understand in seconds.\n\nTechnical leadership. Lead design reviews, review code across teams, and mentor senior and mid-level engineers. Settle technical disagreements with clear reasoning.\n\nCross-team work. Partner with product, design, platform, and security engineers to plan and deliver work that spans teams. Break large projects into pieces others can pick up.\n\nHands-on AI work. Be an advocate for building an AI native SDLC and PDLC with associated tooling.\n\nWhat We're Looking For\n10+ years building production web applications, with at least 3 years in a senior, staff, or principal technical leadership role.\n\nDeep experience with TypeScript, React, and Node.js. Experience with React Router or Remix, or another server-rendered full-stack framework.\n\nStrong backend skills. Production experience with Go or a comparable language, and with building services and REST or GraphQL APIs.\n\nSolid SQL and data modeling skills. Experience designing for multi-tenant SaaS.\n\nWorking knowledge of Docker and Kubernetes, and of CI/CD pipelines.\n\nDemonstrated mastery in architecture design, enterprise scalability, and cross-domain tech stacks.\n\nWhat Will Make You a Stellar Candidate\nYou have owned a platform, not just features. You can point to a system you designed, ran in production, and lived with for years, including the parts you would change.\n\nYou are equally good at the UI and the service behind it. You care about what a user sees and about what happens to the request after they click.\n\nYou have built for enterprise customers. You know what role-based access, audit logs, and tenant isolation require, and you plan for them early.\n\nYou write things down. Your design docs and ADRs are clear enough that someone new can follow the reasoning a year later.\n\nYou have shipped with LLM APIs or AI-assisted tooling. You have a view on where it helps and where it does not.\n\nYou have worked in a startup. You are comfortable with unclear scope and changing priorities, and you pick a direction and move.\n\nWhy This Role\nYou set the technical direction for the product application at a company growing fast in AI security.\n\nEnterprise customers use what you build to govern real AI activity, so the work matters from day one.\n\nYou work directly with product, design, and the CEO's leadership team, with few layers between you and the decision.\n\nThe problems are new. AI security has no settled playbook, and you help write it.\n\nBenefits:\nHybrid work environment\n\nCompetitive salary and equity\n\nHealth, dental, and vision insurance\n\n401(k) plan\n\nOpportunities for professional development and growth\n\nGenerous vacation policy\n\nSalary:\n$216,000 - $274,000 (The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.)","description_format":"text","description_chars":5192,"description_truncated":false,"requirements":{"experience_years_min":10,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Generous vacation","Hybrid work","Professional development","Vision insurance"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Cybersecurity","AI Governance & Compliance"],"lifecycle":[{"event":"open","at":"2026-11-13T14:27:41Z"}],"visa":[{"country":"US","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"H-1B filings in 12 months: 3","filings_12m":3,"filings_prev_12m":2,"green_card_filings_12m":0,"median_offered_wage_usd":132500,"route":null,"cap_exempt":false,"checked_at":"2026-11-12T07:36:15+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)"],"filings_for_role_12m":2}],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":57,"reasons":["conf:1","win:early"],"computed_at":"2026-11-13T16:25:51Z"},"pay":{"stated_usd_annual":274000,"is_top_pay":true},"html_url":"https://alion.io/job/witnessai-staffprincipal-fullstack-software-engineer","json_url":"https://alion.io/job/witnessai-staffprincipal-fullstack-software-engineer.json","meta":{"generated_at":"2026-11-13T16:25:51Z","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":32915,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-14T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":63230},"rest":"https://alion.io/mcp/rest/get_company?id=63230"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fwitnessai-staffprincipal-fullstack-software-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"free","price":{"credits":0,"usd":0},"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%2Fwitnessai-staffprincipal-fullstack-software-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Fwitnessai-staffprincipal-fullstack-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/witnessai-staffprincipal-fullstack-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fwitnessai-staffprincipal-fullstack-software-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":4258319}},{"tool":"search_jobs","arguments":{"company":"witness.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":4258319},"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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