{"id":52154,"url":"https://alion.io/job/langchain-frontend-engineer-ai-observability-evals-platform","title":"Frontend Engineer, AI Observability & Evals Platform","company":{"id":4855,"name":"LangChain","domain":"langchain.com","url":"https://alion.io/company/langchain","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":90,"open_postings":48,"ghost_share":0,"stale_share":0.188,"repost_share":0,"time_to_fill_p50_days":72,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Frontend","role_family":"Frontend","seniority":"junior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Francisco, United States","New York, United States","Boston, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":160000,"max":195000,"currency":"USD","period":"year","gross":null,"usd_annual":195000},"salary_estimate":null,"experience_years_min":2,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Babel","optional":false},{"name":"Cloudflare","optional":false},{"name":"JavaScript","optional":false},{"name":"LangChain","optional":false},{"name":"LangGraph","optional":false},{"name":"LangSmith","optional":false},{"name":"LLM","optional":false},{"name":"Monday.com","optional":false},{"name":"npm","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false},{"name":"Vite","optional":false},{"name":"Webpack","optional":false},{"name":"Yarn","optional":false},{"name":"AI Agents","optional":true}],"status":"live","first_seen_at":"2026-08-12T01:29:10Z","employer_posted_date":"2026-08-12","last_verified_at":"2026-10-17T14:33:14Z","board_verified":true,"closed_at":null,"days_open":66,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":66},"description":"About Us\nAt LangChain, our mission is to make intelligent agents ubiquitous. We build the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents that teams can rely on. We began as widely adopted open-source tools and have grown to also offer a platform for building, evaluating, deploying, and operating agents at scale.\nWith $125M raised at Series B from IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we’re at a stage where we’re continuing to develop new products, growth is accelerating, and all team members have meaningful impact on what we build and how we work together. LangChain is a place where your contributions can shape how this technology shows up in the real world.\nToday, our platform includes LangSmith (Observability, Evaluation, Deployment, Fleet, and Sandboxes), our open source frameworks (LangChain, LangGraph, and Deep Agents), and the newly launched LangSmith Engine for autonomous agent improvement. We have 100M+ monthly open source downloads, 6,000+ active LangSmith customers, and 5 of the Fortune 10 use LangSmith in production (+ 35% of the Fortune 500 overall), including teams at Klarna, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, LinkedIn, Monday.com, Nvidia, and Bridgewater.\nAbout The Role:\nWe’re looking to add a frontend engineer to develop and enhance new features on LangSmith, working on our enterprise platform product for LLM application observability, testing, and debugging.\n* This role can be based in our San Francisco, New York, or Boston office. Employees within commuting distance work from the office five days per week. Candidates who live outside commuting distance (e.g. >1hr each way), may be eligible for hybrid arrangements depending on location and role requirements.\nWhat You Will Do:\nDevelop new user-facing features using React & Typescript\n\nBuild reusable components and front-end libraries for future use\n\nTranslate designs and wireframes into high-quality code\n\nOptimize components for maximum performance across a vast array of web-capable devices and browsers\n\nCollaborate with fullstack and backend developers and UX/UI designers, to enhance usability\n\nWhat You Will Bring:\n2+ years of Front-end engineering experience with strong proficiency in React, JavaScript and TypeScript\n\nHands-on experience with front-end development tools like Babel, Vite, Webpack, NPM, and Yarn\n\nFamiliarity with REST APIs and experience working closely with fullstack and backend engineers\n\nKnowledge of modern authorization mechanisms, such as JWTs\n\nA passion for user experience, design and building clean, engaging, and intuitive interfaces\n\nStrong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders\n\nThe DNA to thrive in a start-up, fast-paced environment. Views unstructured environments as an opportunity to figure out the most impactful work and help define the future success of the company\n\nAn ownership mind-set. You are self-driven and look for opportunities to make an impact.\n\nStrong computer science fundamentals, ideally with a degree in computer science or related field\n\nCompensation\nAnnual salary range: $160,000-$195,000 USD\n\nCompensation Philosophy:\nWe offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks.\nWe are hiring for this role across a range of scope, and the compensation band reflects that. Your offer depends on what we learn about your impact, craft, leadership, and communication during the interview process. We will tell you early where you’re tracking and talk comp with you before offer stage. 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