Senior Fullstack Engineer, Growth & Monetization

LangChain
San Francisco, New York, Boston, Cambridge
Workplace: OnsiteFull timeUSD 175,000 - 225,000 annuallyFunction: Software EngineeringSkills: ["Communication","Collaboration","Ownership","Problem-solving","Prioritization"]

Senior Fullstack Engineer to build growth-focused product features across React, TypeScript, Python, and Go. You’ll design and ship onboarding, experimentation systems, and monetization-driven enhancements, collaborating with product, design, GTM, and analytics. This in-person, high-impact 0→1 role spans New York City, San Francisco, or Boston, with growth levers and developer-focused growth initiatives.

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LangChain
LangChain
10 months ago

Senior Fullstack Engineer, Growth & Monetization

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 19 hours agoStatus: Closed

Job Summary

Senior Fullstack Engineer to build growth-focused product features across React, TypeScript, Python, and Go. You’ll design and ship onboarding, experimentation systems, and monetization-driven enhancements, collaborating with product, design, GTM, and analytics. This in-person, high-impact 0→1 role spans New York City, San Francisco, or Boston, with growth levers and developer-focused growth initiatives.
Location: San Francisco, New York, Boston, Cambridge
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering

Key Responsibilities

  • •Build full-stack features across React/TypeScript/Python/Go to drive growth and retention.
  • •Develop flexible experimentation systems to target diverse growth metrics.
  • •Participate in data-driven, rapid growth experiments across onboarding to monetization.
  • •Design and ship onboarding features to accelerate time to value.
  • •Build growth levers including usage-based guardrails, upgrade triggers, and contextual CTAs.

Pay and Benefits

Salary: USD 175,000 - 225,000 annually
Perks:Health InsuranceDental401kLife InsurancePaid Leave

Key Requirements

  • •Proficiency across React, TypeScript, Python, and Go to deliver full-stack features for growth and retention.
  • •Strong track record in monetization, pricing, or activation features.
  • •Familiarity with usage metering, subscriptions, and pricing experiments.
  • •Experience with REST APIs, Postgres, Redis, and modern backend infrastructure.
  • •Startup experience with fast-paced, zero-to-one environments and ownership mindset.
Experience:SaaSAIDeveloper Tools
Skills:CommunicationCollaborationOwnershipProblem-solvingPrioritization
Languages:English
Tech Stack:ReactTypeScriptPythonGoREST APIsPostgresRedisLLMsGenAI

Company Brief

LangChain
Provides an open-source framework and commercial platform (LangSmith/LangGraph) for building, testing, monitoring, and deploying LLM-powered applications and agentic AI for developers and enterprises.
Industry: Developer Tools
Company Size: Medium (51 to 250 employees)
Revenue: USD 10M to 25M
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series B
Headquarters: San Francisco, United States
Founded: 2022
WebsiteLinkedIn