About LangChain:
At LangChain, our mission is to make intelligent agents ubiquitous. We provide the agent engineering platform and open source frameworks developers need to ship reliable agents fast.
Our open source frameworks, LangChain and LangGraph, see over 90+ million downloads per month and help developers build agents with speed and granular control. LangSmith offers observability, evaluation, and deployment for rapid iteration, enabling teams to transform LLM systems into dependable production experiences.
LangChain is trusted by millions of developers worldwide and powers AI teams at companies like Replit, Clay, Cloudflare, Harvey, Rippling, Vanta, Workday, and more.
About the role:
LangChain is hiring a Senior Fullstack Engineer to build the foundational product features and integrations that power user acquisition, rapid experimentation, and self-serve expansion. This is a high-impact 0→1 role on a newly formed team responsible for building growth systems from the ground up. You’ll work closely with product, design, GTM, and analytics to streamline activation, optimize packaging, and deliver a seamless growth story for developers and enterprise customers alike. This role will be in person 5 days/week in New York City, San Francisco, or Boston.
What you will do:
Work across our stack (React, TypeScript, Python, Go) to deliver full-stack product features that drive growth and retention
Build flexible experimentation systems and processes capable of targeting diverse growth metrics
Participate in data-driven, rapid growth experiments across the user funnel from onboarding to monetization
Design and ship new onboarding features and improvements that accelerate time to value
Build growth levers including usage-based guardrails, smart upgrade triggers, and contextual CTAs
Collaborate closely with product, design, GTM, and analytics teams to identify, prioritize, and execute high-impact growth opportunities
How to be successful in this role:
Extensive fullstack software development experience using React, TypeScript, and Go and/or Python
Strong product intuition and a track record of working on monetization, pricing, or activation features
Familiarity with usage metering, subscriptions, and internal tooling for pricing experiments
Comfortable working with REST APIs, Postgres, Redis, and modern backend infra
Startup DNA with the ability to thrive in fast-paced, zero-to-one environments
Self-directed with an ownership mindset
Bonus: Experience building for developers or product-led growth platforms
Bonus: Familiarity with LLMs, GenAI applications, or agentic frameworks
Compensation: 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. Salary Range: $155,000-$195,000 USD
Top Skills
What We Do
LangChain is the platform for building reliable agents. Our products power top engineering teams — from fast-growing startups like Lovable, Mercor, and Clay to global brands including AT&T, Home Depot, and Klarna.
LangGraph is a low-level orchestration framework for building controllable agents and long-running workflows. It’s used in production by teams at Replit, Uber, LinkedIn, GitLab, and more.
LangSmith offers unified evaluation and monitoring to help developers debug, evaluate, and improve their agents at scale.
LangChain provides hundreds of integrations and composable components, making it easy to connect with the latest models, tools, and databases — with minimal engineering overhead.
Together, these tools help teams build, deploy, and manage enterprise-grade agents, faster.
