Senior Fullstack Engineer, Growth & Monetization

About LangChain

At LangChain, our mission is to make intelligent agents ubiquitous. We help developers build mission-critical AI applications across the entire agent development lifecycle. Our open source frameworks — LangChain and LangGraph — see over 70+ million downloads per month. Developers rely on LangChain for composable integrations and LangGraph for controllable agent orchestration. Our commercial agent platform, consisting of LangSmith and LangGraph Platform, enables teams to build, test, run, and manage agents at scale across their organization.

Founded in 2023, LangChain powers top engineering teams at companies like Replit, Lovable, Clay, Klarna, LinkedIn, and more.

LangChain is hiring a 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 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 & Benefits

• Competitive salary and equity stake for role and stage of company. Commensurate with experience.

• Annual salary range: $175,000 - $195,000