{"id":462122,"url":"https://alion.io/job/linkup-senior-full-stack-engineer","title":"Senior Full Stack Engineer","company":{"id":177978,"name":"Linkup","domain":"linkup.so","url":"https://alion.io/company/linkup-2","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"C","score":66,"open_postings":14,"ghost_share":0.571,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-29T05:49:05Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":144000,"max_usd":268000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":3667},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Embeddings","optional":false},{"name":"Multimodal AI","optional":false},{"name":"React.js","optional":false},{"name":"GitHub Actions","optional":true},{"name":"Java","optional":true},{"name":"JavaScript","optional":true},{"name":"Kubernetes","optional":true},{"name":"Nest.JS","optional":true},{"name":"Node JS","optional":true},{"name":"OpenSearch","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Python","optional":true},{"name":"Terraform","optional":true},{"name":"Vespa","optional":true}],"status":"live","first_seen_at":"2025-11-03T21:53:40Z","employer_posted_date":"2025-11-03","last_verified_at":"2026-10-29T04:28:45Z","board_verified":true,"closed_at":null,"days_open":359,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":359},"description":"About the role\nWe’re looking for a top-tier Full Stack Engineer to join Linkup and work hand-in-hand with our CTO, Denis Charrier, and the rest of the tech team.\nYour core responsibilities will be to:\nBuild and operate large-scale, distributed systems powering AI-ready web search\n\nDevelop APIs, frontends, and data pipelines for indexing, retrieval, and monitoring\n\nDesign and implement intuitive, high-performance user interfaces for developers and enterprise users\n\nMaintain our web app and other user-facing products\n\nOptimize performance, scalability, and resource usage across our stack\n\nParticipate in architecture discussions and contribute to system design\n\nCollaborate with ML and product teams to deliver data-driven features\n\nWrite clean, maintainable code and participate in code reviews\n\nRequirements\nYou’re a great match if you:\nAre excited to help build Google for AI agents- and believe in Linkup’s mission\n\nHave strong experience in both frontend and backend development (3y minimum)\n\nUnderstand distributed systems, APIs, and modern frontend frameworks (React or similar)\n\nCare about performance, reliability, and code quality - both server-side and client-side\n\nEnjoy debugging tough production issues and optimizing performance bottlenecks\n\nAre curious about AI infrastructure and retrieval systems\n\nThrive in a fast-paced, high-ownership startup environment\n\nExample Projects\nBuild an interactive dashboard showing live metrics from billions of indexed web pages\n\nDesign developer tools for querying Linkup’s search API and visualizing retrieved facts\n\nAdd multimodal search (text + images + audio) under 150 ms\n\nImplement internal UIs for data validation, ranking evaluation, and retraining workflows\n\nStream 1 B embeddings/day while minimizing compute costs\n\nOur Stack\nNode.js / NestJS\n\nReact\n\nPython\n\nJava\n\nPostgreSQL\n\nOpenSearch\n\nVespa\n\nApache Storm\n\nKubernetes\n\nGitHub Actions\n\nTerraform\n\nDetails\nThe ideal candidate will play a central role in our engineering team, partnering closely with the founders to spearhead groundbreaking products. Your expertise will shape the future of AI-powered applications and bring our vision to life.\nWe offer a flexible remote-work policy- see the details here.\nJoin us and leverage your expertise to push the boundaries of AI!\nAbout Linkup\nOur Vision\nWe believe in a future of AI agents and the agentic web. These digital entities can create more value for humanity than we ever could alone, but they depend on the internet to operate, collaborate, take action, and gather information.\nAI agents need web search. To perform well, they require information that is current, reliable, and context-specific-not the diffuse, steadily aging knowledge frozen at their last training cut-off.\nModern web search is built for humans, not AIs. Instead of trusted facts, it serves links, ads, and click-bait. People want visually engaging pages; AI systems need structured truth. An AI can absorb oceans of data, while human attention barely skims the surface. Humans think visually and intuitively; AI reasons in latent space.\nWeb 2.0 is sunsetting. The deck is being reshuffled, and the Bing-Google search oligopoly is crumbling. Indexing ever more pages is no longer the goal; semantically organizing facts for AI systems is. In the coming agentic web, Google’s ad-driven model has no natural home.\nSearch for AI must be rebuilt from the ground up. We are reconstructing the web as a rigorously structured knowledge layer, mapping every concept, entity, and claim into a coherent semantic graph. This foundation delivers verified facts and rich context to AI instantly, unlocking faster reasoning, higher accuracy, and radically more useful answers for everyone.\nHumans search Google; AI searches Linkup.\nOur Mission\nReality never stands still, and neither should intelligence. Linkup reconnects language models to a living stream of verified facts, ensuring AIs remain as current and insightful as the world they serve.\nOur mission is to deliver the world’s freshest, most trusted knowledge to AIs.\nOur Culture\nOur culture is built on the following values:\nMission. We believe we play a critical role in building the agentic web. We are 100% committed to our mission of bringing the reality of the world to AI agents.\n\nSpeed. We build fast, we build to last. We get things done, well.\n\nOwnership. We empower every team member to take ownership of their projects, ensuring they see them through to successful completion.\n\nTeamwork. Our strength lies in our unity. We rely on one another and embrace our diversity as a core asset.\n\nHumility. We maintain low egos, showing respect for others and continuously learning from their insights and experiences.\n\nWe expect all team member to take an active role in shaping our company culture.\nOur Team\nWe are small technical team, working shoulder to shoulder to build the web of agents.\nA bit more about our 3 co-founders:\nPhilippe Mizrahi - Led the development of Lyft’s Autonomous Vehicles marketplace. Previously launched Amundsen, an open source search engine.\n\nDenis Charrier - Founding Engineer at Niland, an audio search company (acquired by Spotify), then Staff Engineer at Spotify. 15y of software development experience.\n\nBoris Toledano - Led robotics at Carrefour, after 3y at McKinsey & Co working on public affairs and digital transformation.","description_format":"text","description_chars":5352,"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":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Search Engines","AI Search"],"lifecycle":[{"event":"open","at":"2026-09-06T11:25:04Z"},{"event":"open","at":"2026-09-25T23:37:29Z"}],"visa":[],"liveness":{"score":5,"band":"cold","label":"Long shot","p_open":1,"p_active":0.19,"p_room":0.28,"age_days":359,"expected_fill_days":36,"reasons":["conf:1","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-29T05:49:05Z"},"pay":null,"html_url":"https://alion.io/job/linkup-senior-full-stack-engineer","json_url":"https://alion.io/job/linkup-senior-full-stack-engineer.json","meta":{"generated_at":"2026-10-29T08:33:49Z","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":12900,"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":177978},"rest":"https://alion.io/mcp/rest/get_company?id=177978"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flinkup-senior-full-stack-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%2Flinkup-senior-full-stack-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%2Flinkup-senior-full-stack-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/linkup-senior-full-stack-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flinkup-senior-full-stack-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":462122}},{"tool":"search_jobs","arguments":{"company":"linkup.so","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":462122},"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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