{"id":747057,"url":"https://alion.io/job/leadallies-senior-staff-principal-frontend-engineer","title":"Senior · Staff · Principal Frontend Engineer","company":{"id":678941,"name":"Lead Allies","domain":"leadallies.com","url":"https://alion.io/company/leadallies","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":7,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-11-03T05:54:40Z"}},"role":"Frontend","role_family":"Frontend","seniority":"lead","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"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":147000,"max_usd":291000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":46},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Angular","optional":false},{"name":"Git","optional":false},{"name":"JavaScript","optional":false},{"name":"React.js","optional":false},{"name":"Vue.js","optional":false},{"name":"TypeScript","optional":true}],"status":"live","first_seen_at":"2025-05-21T00:34:29Z","employer_posted_date":"2025-05-21","last_verified_at":"2026-11-04T00:12:53Z","board_verified":true,"closed_at":null,"days_open":532,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":531},"description":"Senior / Staff / Principal Frontend Engineer\nLocation: Onsite San Francisco\nWe have multiple startups interested in talent. Here is a generic summary. Instead of a perfect job description, we present talented individuals to companies and allow them to share how that talent fits in the organization.\nA Front-End Developer is responsible for building the user-facing parts of websites and web applications, ensuring a seamless and visually appealing user experience. They translate designs into functional code using HTML, CSS, and JavaScript, and may also utilize frameworks and libraries.\nKey Responsibilities:\nDevelop and implement user interfaces: Front-end developers create the visual elements of websites and applications that users see and interact with. • Translate designs into code: They take design mockups and wireframes and translate them into functional code using HTML, CSS, and JavaScript. • Build interactive elements: They create interactive features and animations to enhance the user experience. • Ensure cross-browser compatibility: They make sure the website or application functions correctly across different web browsers and devices. • Optimize page load times: They optimize code for speed and efficiency, ensuring a fast and smooth user experience. • Collaborate with back-end developers: They work closely with back-end developers to integrate the front-end with server-side logic and databases.\nMaintain and update existing websites and applications: They may be responsible for fixing bugs, implementing new features, and maintaining existing code.\nFollow industry best practices: They stay up-to-date on the latest front-end technologies and best practices.\nTest and debug code: They thoroughly test their code to ensure it functions as expected and debug any issues that arise. \nKey Skills:\nHTML, CSS, and JavaScript: Proficiency in these foundational web development languages is essential.\nFront-end frameworks and libraries: Knowledge of frameworks like React, Angular, or Vue.js is often required.\nResponsive design: Ability to create websites and applications that adapt to different screen sizes and devices.\nVersion control systems (Git): Familiarity with version control systems like Git is crucial for collaborative development.\nAccessibility: Understanding of accessibility principles and how to make websites usable for people with disabilities.\nProblem-solving and debugging skills: Ability to identify and resolve issues in the code.\nTesting and debugging: Ability to test and debug code to ensure it functions correctly.\nCompensation: Market range and can include equity - details can be provided after the specific client is determined.","description_format":"text","description_chars":2683,"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":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-09-11T14:29:20Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"Filed H-1B visas in the last two years","filings_12m":0,"filings_prev_12m":1,"green_card_filings_12m":0,"median_offered_wage_usd":null,"route":null,"cap_exempt":false,"checked_at":"2026-10-29T16:27:21+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)"],"filings_for_role_12m":0}],"liveness":{"score":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.145,"p_room":0.28,"age_days":531,"expected_fill_days":28,"reasons":["conf:1","agency","win:tail","crowd:"],"computed_at":"2026-11-03T05:54:40Z"},"pay":null,"html_url":"https://alion.io/job/leadallies-senior-staff-principal-frontend-engineer","json_url":"https://alion.io/job/leadallies-senior-staff-principal-frontend-engineer.json","meta":{"generated_at":"2026-11-04T04:26:29Z","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":6938,"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":678941},"rest":"https://alion.io/mcp/rest/get_company?id=678941"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fleadallies-senior-staff-principal-frontend-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%2Fleadallies-senior-staff-principal-frontend-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%2Fleadallies-senior-staff-principal-frontend-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/leadallies-senior-staff-principal-frontend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fleadallies-senior-staff-principal-frontend-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":747057}},{"tool":"search_jobs","arguments":{"company":"leadallies.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":747057},"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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