{"id":138887,"url":"https://alion.io/job/kernel-browser-security-engineer","title":"Browser Security Engineer","company":{"id":50861,"name":"Kernel","domain":"kernel.sh","url":"https://alion.io/company/kernel-sh","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":4,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Security","role_family":"Security","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Francisco, United States","New York, United States","Seattle, United States","Cincinnati, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":225000,"max":250000,"currency":"USD","period":"year","gross":null,"usd_annual":250000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"DNS","optional":false},{"name":"Framer","optional":false},{"name":"Linux","optional":false},{"name":"TCP/IP","optional":false},{"name":"Vercel","optional":false}],"status":"live","first_seen_at":"2026-08-13T21:19:46Z","employer_posted_date":"2026-08-13","last_verified_at":"2026-10-17T00:53:24Z","board_verified":true,"closed_at":null,"days_open":64,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":64},"description":"About Kernel\nKernel is crazy fast, open source browser infrastructure for AI agents. We handle autoscaling, observability, and the messy details of web interaction, so developers can focus on what their agents do instead of how they do it.\nTeams at Cash App, Framer, and 7000+ others use Kernel for deep research, QA automation, and real-time web analysis. We've raised $22M from Accel, YC, and Vercel.\nIf you're interested in building critical infrastructure for agents on the web, we'd love to chat.\n\nAbout the role\nWe’re hiring a Browser Security Engineer to harden and extend our Chromium-based browser runtime. You’ll work at the intersection of sandboxing, networking, and virtualization - ensuring our browsers run securely and efficiently across thousands of concurrent users.\n\nWhat you’ll do\nDebug, patch, and optimize Chromium builds running inside Kernel’s microVM environments.\nImplement and maintain network isolation, proxy routing, and IP handling for browsers.\n\nCollaborate with infra engineers on unikernel-based isolation, process scheduling, and kernel security policies.\n\nBuild internal tooling for binary analysis, crash triage, and vulnerability monitoring.\n\nSupport the team in maintaining secure supply chain and reproducible builds for our browser images.\n\nWhat we’re looking for\nDeep familiarity with Chromium internals, browser sandboxes, or renderer/network stacks.\n\nExperience with Linux kernel, microVMs (Firecracker, Cloud-Hypervisor, Kata, gVisor, etc.), or container isolation.\n\nStrong debugging skills with strace, gdb, perf, or similar low-level tools.\n\nKnowledge of networking fundamentals (DNS, TCP/IP, NAT, proxies, TLS).\n\nBackground in security engineering or browser hardening a plus.\n\nWhat you can expect as a Kernel\nIndustry-competitive salary\n\nAbove market equity\n\nPremium medical + dental coverage + dependent coverage\n\nSmall, trusting team of senior + staff engineers\n\nDefault async with minimal bureaucracy\n\nDaily lunches on us\n\nUnlimited PTO\n\n401k + company match\n\nRelocation assistance\n\nHiring process\nWe have a simple process focused on real world collaboration and jointly getting to know each other:\n30 minute intro calls with one of Kernel’s co-founders\n\n45-minute technical interview (virtual)\n\nHalf-day on-site (in-person) working with our team on relevant technical challenges.\n\nOffer!","description_format":"text","description_chars":2340,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["401k plan","Equity","Relocation assistance","Unlimited PTO"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Developer Tools"],"lifecycle":[{"event":"open","at":"2026-08-13T21:19:46Z"}],"visa":[],"liveness":{"score":13,"band":"cold","label":"Long shot","p_open":1,"p_active":0.352,"p_room":0.36,"age_days":63,"expected_fill_days":33,"reasons":["conf:2","win:tail","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":{"stated_usd_annual":250000,"is_top_pay":true},"html_url":"https://alion.io/job/kernel-browser-security-engineer","json_url":"https://alion.io/job/kernel-browser-security-engineer.json","meta":{"generated_at":"2026-10-17T04:36:16Z","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":6005,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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":50861},"rest":"https://alion.io/mcp/rest/get_company?id=50861"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fkernel-browser-security-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%2Fkernel-browser-security-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%2Fkernel-browser-security-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/kernel-browser-security-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fkernel-browser-security-engineer"}]}