{"id":775191,"url":"https://alion.io/job/cerby-sr-software-engineer-frontend-extensions-team","title":"Sr. Software Engineer (Frontend) - Extensions Team","company":{"id":40488,"name":"Cerby","domain":"cerby.com","url":"https://alion.io/company/cerby","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Rippling","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":"2026-10-28T05:59:10Z"}},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":124000,"max_usd":229000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":54},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"CI/CD","optional":false},{"name":"Datadog","optional":false},{"name":"IAM","optional":false},{"name":"OpenTelemetry","optional":false},{"name":"pnpm","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false},{"name":"GDPR","optional":true},{"name":"JavaScript","optional":true},{"name":"SOC 2","optional":true}],"status":"live","first_seen_at":"2026-06-29T22:25:09Z","employer_posted_date":"2026-06-29","last_verified_at":"2026-10-29T02:53:32Z","board_verified":true,"closed_at":null,"days_open":121,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":120},"description":"About Cerby\nAt Cerby, security is everyone's business.\nCerby extends your security perimeter to include your disconnected applications, providing identity automation and eliminating manual processes. It's one of the biggest blind spots in enterprise security, and we're the team closing it. If you want to work alongside the team solving one of the hardest, most overlooked problems in security, you're in the right place.\nFounded in 2020, Cerby is backed by leading investors and trusted by enterprises across the globe.\n About the Role\nAt Cerby, software engineers are at the heart of driving technology and product innovation. As a Senior Software Engineer on the Extension team, you will own and scale the browser extension at the core of Cerby's platform - the surface where users manage application passwords, autofill and inject credentials across the sites they use every day, and authenticate through passkeys and federated identity providers. The extension is a cross-browser Manifest V3 product shipping to Chrome, Edge, Firefox, and Safari, backed by service-worker-driven background synchronization, secure session lifecycle management.\nIn this role you will own the quality, performance, and security of the extension end-to-end, help lead a security-first engineering culture, and sharpen a product experience that our users' most sensitive credential interactions depend on. Because the extension injects UI into pages we don't control and brokers our users' most sensitive data, security is not a phase of the work - it isthe work. You are also expected to embrace AI as a core part of how we build, actively exploring and incorporating AI-assisted tools and practices into your daily development workflow to improve team efficiency and accelerate impact.\nKey Responsibilities\nDesign and Develop: Build scalable, high-performance software solutions that align with business goals and user needs, leveraging AI-assisted tools and techniques as part of your engineering practice.\nCollaborate: Work closely with product managers, engineering managers, UX designers, and other engineers to deliver high-quality features and functionality.\nCode Excellence: Write clean, maintainable, and efficient code, adhering to best practices and coding standards. Help define and promote best practices across the engineering org, including how AI tools can be responsibly and effectively integrated into development workflows.\nContinuous Improvement: Participate in code reviews, share knowledge with team members, and continuously improve development processes.\nInnovation and Curiosity: Champion new technologies, frameworks, and methodologies that drive innovation and product evolution, while continuously exploring ways to leverage AI in your day-to-day work to boost personal efficiency and empower those around you to do the same.\nSecurity Mindset: Actively contribute to our security-first approach by proactively identifying vulnerabilities and implementing robust solutions, including treating the frontend dependency ecosystem as a security surface: owning PNPM workspace governance, auditing packages for CVEs, enforcing patching SLAs, and managing supply-chain risk across transitive dependencies. Applies the same critical lens to how AI tools are adopted in development workflows, evaluating their security implications and ensuring they don’t introduce new vectors for risk.\nRemote Collaboration: Collaborate effectively in a remote-first environment, ensuring seamless communication and teamwork across time zones.\nCulture: Demonstrates leadership and lives Cerby’s core values to achieve positive outcomes. Help cultivate an environment where experimenting with AI is encouraged, learnings are shared openly, and the team grows together.\nProblem-Solving: Strong analytical and problem-solving skills with a focus on delivering high-quality solutions.\nCommunication Skills: Ability to communicate complex technical concepts clearly and concisely both in written and verbal form\nTeam Collaboration: Collaborate and thrive in agile teams, actively mentoring engineers, sharing knowledge across the org, and leveraging AI to accelerate documentation (runbooks, ADRs, onboarding guides, post-mortems) to free more time for the deep technical conversations that actually transfer expertise.\nQualifications & Required Skills\nExperience:\n5+ years of professional software engineering experience, with a focus on building and scaling SaaS applications.\nPrior experience developing and maintaining Distributed Applications\nPrevious experience mentoring junior developers and conducting security-first code reviews\nTechnical Expertise:\nManifest V3 service-worker model: ephemeral execution and state persistence across termination (chrome.alarms, keep-alive), plus the distributed-system concerns that come with it - cross-tab coordination, background sync, and token-refresh/session races.\nContent scripts and injection into untrusted pages: isolated-world vs MAIN-world execution, Shadow DOM isolation, and MutationObserver-based DOM resilience.\nMessage passing across content scripts, service worker, popup/side panel, and offscreen documents, with sender/origin validation as a security boundary.\nCross-browser delivery to Chrome, Edge, Firefox, and Safari: API divergence (chrome.* vs browser.*), MV2/MV3 differences, Safari packaging, and per-store review/release (staged rollout, rollback, remote-code ban).\nNative messaging with native host applications, plus extension-specific performance (service-worker cold-start, bundle size, content-script efficiency).\nProficiency in:\nStrong React + TypeScript with utility-first CSS (e.g., TailwindCSS), building UI across extension surfaces (popup, options, side panel, in-page) that is responsive, accessible (WCAG/ARIA), and reusable via a design system.\nCore frontend and browser fundamentals: browser API, client-side storage (localStorage, IndexedDB, chrome.storage), networking (fetch/XHR), and performance optimization.\nDesigning, consuming, and optimizing REST APIs with efficient data-fetching and caching (e.g., TanStack Query).\nFront-end security: mitigating XSS, CSRF, and CORS, and applying CSP, including the extension's own CSP model.\nModern authentication and identity: OAuth 2.0 / OIDC, SAML, SCIM, and WebAuthn / FIDO2 / passkeys; prior IAM or security experience.\nTesting (unit, integration, component) and observability (metrics, traces, logs; OpenTelemetry/Datadog a plus), owning delivery end-to-end from design to production in an Agile/CI-CD environment.\nNice to have:\nExperience working with security compliance frameworks (SOC 2, GDPR, HIPPA, etc.)\nFamiliarity with encryption processes and key management. \nPrior experience in a venture-funded high-growth SaaS startup preferred.\nDesired Qualities\nResourceful Achiever: Self-motivated, proactive, and adaptable in solving complex technical challenges.\nProduct Minded: Strong ability to understand customer value, to translate customer needs into software products that deliver tangible customer value.\nPrecision Executor: Focused on optimizing performance, scalability, and reliability in software delivery.\nTeam Player: Strong interpersonal skills, fostering a culture of collaboration and shared success. Actively mentor other engineers.\nLifelong Learner: A continuous curiosity to learn and explore emerging technologies and industry trends.\nInnovative Thinker: Open to creative solutions and comfortable navigating ambiguity.","description_format":"text","description_chars":7466,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Identity Management","Information Security"],"lifecycle":[{"event":"open","at":"2026-09-11T22:41:47Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 1","filings_12m":1,"filings_prev_12m":0,"green_card_filings_12m":0,"median_offered_wage_usd":272500,"route":null,"cap_exempt":false,"checked_at":"2026-10-15T11:24:14+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)"],"filings_for_role_12m":0}],"liveness":{"score":15,"band":"cold","label":"Long shot","p_open":1,"p_active":0.525,"p_room":0.28,"age_days":120,"expected_fill_days":38,"reasons":["conf:0","win:tail","crowd:"],"computed_at":"2026-10-28T05:59:10Z"},"pay":null,"html_url":"https://alion.io/job/cerby-sr-software-engineer-frontend-extensions-team","json_url":"https://alion.io/job/cerby-sr-software-engineer-frontend-extensions-team.json","meta":{"generated_at":"2026-10-29T03:05:01Z","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":4643,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-30T00:00:00Z"}},"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":40488},"rest":"https://alion.io/mcp/rest/get_company?id=40488"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcerby-sr-software-engineer-frontend-extensions-team"},{"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%2Fcerby-sr-software-engineer-frontend-extensions-team"},{"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%2Fcerby-sr-software-engineer-frontend-extensions-team"},{"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/cerby-sr-software-engineer-frontend-extensions-team\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcerby-sr-software-engineer-frontend-extensions-team"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":775191}},{"tool":"search_jobs","arguments":{"company":"cerby.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":775191},"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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