JavaScript Engineer (Open Source Team)

About Us:At 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.Today, LangChain, LangGraph, LangSmith, and Agent Builder are used by teams shipping real AI products across startups and large enterprises. Millions of developers trust LangChain to power AI teams at companies like Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500.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.About the role:We’re looking to add a core maintainer to the LangChain team. This person would be responsible for maintaining and improving the LangChain JavaScript package. In-person in SF preferred.Improving the core abstractions and runtime of the langchain and langgraph packagesImproving documentationAnswering user questions and resolving issuesUse langchain to build example applicationsHow to be successful in this role3+ years of software engineering or applied machine learning backgroundHave a Software Engineering backgroundHave strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholdersCan thrive in a fast-moving environment. Views unstructured environments as an opportunity to figure out the most impactful work and define the future success of the companyAre ownership-minded. You excel at managing your work efficiently and effectively without the need for close supervisionCompensation & Benefits:We offer competitive compensation that includes base salary, meaningful equity, and benefits such as health and dental coverage, flexible vacation, a 401(k) plan, and life insurance. Actual compensation will vary based on role, level, and location. For team members in the EU and UK, we provide locally competitive benefits aligned with regional norms and regulations.Annual salary range: $150,000- $225,000