{"schemaVersion":"jobsearcher.job.v1","id":"d08d195236d4b9f4e14362fa","url":"https://jobsearcher.com/jobs/d08d195236d4b9f4e14362fa","canonicalUrl":"https://jobsearcher.com/jobs/d08d195236d4b9f4e14362fa","title":"Senior Fullstack Engineer","description":"Job Description\n\nFULLY ONSITE IN EL SEGUNDO CA\r\nSalary range 150,000-175,000K PLUS BONUS\r\nSenior Fullstack Engineer: Agentic Infrastructure Team\r\nOur client is looking for a Senior Fullstack Engineer to join our Agentic AI team. You'll help\r\nbuild our AI capabilities from the ground up, designing and shipping tools, services, and intelligent\r\nagents that power AI experiences across our entire product ecosystem.\r\nWhat You'll Do\r\nBuild and ship full-stack AI applications: Create frontend experiences and backend\r\nsystems that power real AI capabilities, iterating based on performance and user\r\nfeedback\r\nOwn the full lifecycle: Take projects from idea through production deployment, ensuring\r\nquality, reliability, and scalability\r\nBuild foundational infrastructure: Develop search/retrieval services, tool execution layers\r\n(MCP servers), workflows, and intelligent agents\r\nEstablish measurement systems: Create feedback loops and performance tracking to\r\ncontinuously improve AI system behavior\r\nSolve complex problems: Debug issues across the stack, identify root causes, and\r\nimplement robust solutions\r\nWhat We're Looking For\r\nFoundation (Required):\r\n5 years shipping production code (frontend and backend)\r\nStrong programming fundamentals: We'll primarily use JavaScript, Python and PHP, but\r\nvalue problem-solving skills over specific language expertise\r\nBackend development experience: Building workflows, APIs, state management, and\r\nasync systems\r\nDatabase knowledge: Working with both SQL and NoSQL databases\r\nFrontend skills: Building responsive interfaces with modern frameworks (React, Vue,\r\nAngular, Svelte, etc.)\r\nExperience applying AI/ML in production: You've worked with LLMs or ML models in real\r\napplications, not just tutorials\r\nWorking Style:\r\nOwnership mindset: You identify problems, take initiative, and see things through\r\nPragmatic and adaptable: You choose the right tool for the job and aren't afraid to learn\r\nnew technologies\r\nSystematic problem-solver: You can debug complex systems and think through tradeoffs\r\nGood to Have:\r\nKnowledge of AI evaluation, error analysis, and building feedback loops\r\nExperience with agentic frameworks (LangGraph, Google ADK) or Model Context\r\nProtocol (MCP)\r\nBackground in information retrieval or search systems","company":"Phaxis","rawCompany":"phaxis","city":"El Segundo","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-11-03T01:56:18.261Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1254.00","title":"Web Developers","slug":"web-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior Fullstack Engineer","description":"Job Description\n\nFULLY ONSITE IN EL SEGUNDO CA\r\nSalary range 150,000-175,000K PLUS BONUS\r\nSenior Fullstack Engineer: Agentic Infrastructure Team\r\nOur client is looking for a Senior Fullstack Engineer to join our Agentic AI team. You'll help\r\nbuild our AI capabilities from the ground up, designing and shipping tools, services, and intelligent\r\nagents that power AI experiences across our entire product ecosystem.\r\nWhat You'll Do\r\nBuild and ship full-stack AI applications: Create frontend experiences and backend\r\nsystems that power real AI capabilities, iterating based on performance and user\r\nfeedback\r\nOwn the full lifecycle: Take projects from idea through production deployment, ensuring\r\nquality, reliability, and scalability\r\nBuild foundational infrastructure: Develop search/retrieval services, tool execution layers\r\n(MCP servers), workflows, and intelligent agents\r\nEstablish measurement systems: Create feedback loops and performance tracking to\r\ncontinuously improve AI system behavior\r\nSolve complex problems: Debug issues across the stack, identify root causes, and\r\nimplement robust solutions\r\nWhat We're Looking For\r\nFoundation (Required):\r\n5 years shipping production code (frontend and backend)\r\nStrong programming fundamentals: We'll primarily use JavaScript, Python and PHP, but\r\nvalue problem-solving skills over specific language expertise\r\nBackend development experience: Building workflows, APIs, state management, and\r\nasync systems\r\nDatabase knowledge: Working with both SQL and NoSQL databases\r\nFrontend skills: Building responsive interfaces with modern frameworks (React, Vue,\r\nAngular, Svelte, etc.)\r\nExperience applying AI/ML in production: You've worked with LLMs or ML models in real\r\napplications, not just tutorials\r\nWorking Style:\r\nOwnership mindset: You identify problems, take initiative, and see things through\r\nPragmatic and adaptable: You choose the right tool for the job and aren't afraid to learn\r\nnew technologies\r\nSystematic problem-solver: You can debug complex systems and think through tradeoffs\r\nGood to Have:\r\nKnowledge of AI evaluation, error analysis, and building feedback loops\r\nExperience with agentic frameworks (LangGraph, Google ADK) or Model Context\r\nProtocol (MCP)\r\nBackground in information retrieval or search systems","datePosted":"2026-11-03T01:56:18.261Z","dateModified":"2026-11-03T01:56:18.261Z","hiringOrganization":{"@type":"Organization","name":"Phaxis","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"El Segundo","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"d08d195236d4b9f4e14362fa"},"url":"https://jobsearcher.com/jobs/d08d195236d4b9f4e14362fa"}}