Senior Fullstack Engineer Monetization

About the role

Lang Chain 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.

• Work across our stack (React, Type Script, 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

• Extensive full-stack software development experience using React, Type Script, 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

• Salary Range: $175,000-$240,000 USD

Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.