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Senior Product Engineer - Growth & Monetization

LangChain· Engineering
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New York, NY$165k - $250kFull-timePosted 4mo ago

About the role

Senior Fullstack Engineer focused on building growth systems for user acquisition, activation, and self-serve expansion. 0→1 role on a new Growth & Monetization team, in-person in New York City, collaborating with product, design, GTM, and analytics to optimize activation, packaging, and monetization.

Responsibilities

  • Lead projects across our stack (React, TypeScript) while working with backend APIs (Python, Go)
  • Build polished, responsive user interfaces for onboarding, self-serve upgrades, and usage dashboards that delight users
  • Design and execute rapid, client-side UI experiments (A/B tests, feature flags) targeting key activation and conversion metrics
  • Partner with Product and Design to translate complex user journeys into simple, intuitive web experiences
  • Implement clean client-side event tracking and behavioral analytics to understand developer journeys
  • Build growth levers, including smart upgrade triggers, usage notifications and personalized, contextual experiences

Qualifications

  • Strong mastery of modern frontend development (React, TypeScript, CSS/Tailwind)
  • Solid fullstack fundamentals (REST/GraphQL APIs, Python/Go backends, database querying and caching)
  • Exceptional UX intuition and a sharp eye for visual polish, micro-interactions, and developer-focused user journeys
  • Experience building or optimizing frontend growth engines (onboarding wizards, conversion funnels, checkout flows, A/B testing frameworks, usage metering, subscriptions)
  • Startup DNA with a desire to ship fast, iterate based on user data, self-directed and take end-to-end ownership
  • Bonus: Experience building tools for developers, PLG SaaS platforms, or design systems
  • Bonus: Familiarity with LLMs, GenAI applications, or agentic frameworks

Skills

Required:Frontend developmentFullstack developmentUX and product thinking
Nice to have:Growth engineering

Benefits

  • medical, dental, and vision coverage
  • flexible vacation
  • a 401(k) plan
  • meals on in-office days in the US
  • and more
Last updated Oct 14, 2026. Interested? Apply on the company site.

About LangChain

Engineer reliable agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

AI agentsagent engineeringbrex-fastest-growing-2025liquid-ai-recruiting-targetopen source frameworksplatform
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