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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Frontend Engineer, AI Observability & Evals Platform - **Company:** Langchain, Inc - **Location:** San Francisco, CA, United States - **Experience:** Experienced - **Salary:** $160,000.0 - $195,000.0 - **Contract:** Permanent contract - **Skills:** LangGraph Framework, Clean Code Principles, JavaScript (Programming Language), Asana, Software Debugging, Design of User Interfaces, Open Source Technology, TypeScript, Website Wireframe, Apache Yarn, ReactJS, Large Language Models, Backend, Agentic-AI, Webpack, LangSmith, Information Technology, Cloudflare, Npm(Software), Machine Learning Operations, Front End Software Development, Restful APIs, Workday - **Published:** October 17, 2026 - **Apply:** https://www.careerbuilder.com/job-details/frontend-engineer-ai-observability-evals-platform-san-francisco-ca--afa8ed80-00c8-45a3-a5e5-5fe5112b3f0a ## About the Role * 2+ years of Front-end engineering experience with strong proficiency in React, JavaScript and TypeScript * Hands-on experience with front-end development tools like Babel, Vite, Webpack, NPM, and Yarn * Familiarity with REST APIs and experience working closely with fullstack and backend engineers * Knowledge of modern authorization mechanisms, such as JWTs * A passion for user experience, design and building clean, engaging, and intuitive interfaces * Strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders * The 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 * An ownership mind-set. You are self-driven and look for opportunities to make an impact. * Strong computer science fundamentals, ideally with a degree in computer science or related field ## Description About UsAt 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.With $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.Today, 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.About The Role: We'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. *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.What You Will Do:Develop new user-facing features using React & TypescriptBuild reusable components and front-end libraries for future useTranslate designs and wireframes into high-quality codeOptimize components for maximum performance across a vast array of web-capable devices and browsersCollaborate with fullstack and backend developers and UX/UI designers, to enhance usabilityWhat You Will Bring:2+ years of Front-end engineering experience with strong proficiency in React, JavaScript and TypeScriptHands-on experience with front-end development tools like Babel, Vite, Webpack, NPM, and YarnFamiliarity with REST APIs and experience working closely with fullstack and backend engineersKnowledge of modern authorization mechanisms, such as JWTsA passion for user experience, design and building clean, engaging, and intuitive interfacesStrong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholdersThe 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 companyAn ownership mind-set. You are self-driven and look for opportunities to make an impact.Strong computer science fundamentals, ideally with a degree in computer science or related fieldCompensationAnnual salary range: $160,000-$195,000 USDCompensation Philosophy:We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. We 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. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.BenefitsBenefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.