# Senior Fullstack Engineer, Growth & Monetization

**Company:** [LangChain](https://hotfix.jobs/companies/langchain)
**Location:** San Francisco, CA, Cambridge, MA, New York, NY
**Role:** Fullstack Engineering
**Salary:** $175k – $240k/yr
**Experience:** 5+ years
**Skills:** React, TypeScript, Python, Go, REST APIs, Postgres, Redis, Usage Metering, Subscriptions, Pricing Experiments
**Posted:** 2025-10-23

> Senior fullstack engineer building growth and monetization systems including onboarding, experimentation, billing, and self-serve expansion features. Works across React, TypeScript, Python, and Go in a high-impact 0→1 role.

## Job Description

## What you'll 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

## What you'll bring
- 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
- Familiarity with LLMs, GenAI applications, or agentic frameworks

## Compensation
- Salary Range: $175,000-$240,000 USD
- Competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks

## Benefits
- Medical, dental, and vision coverage
- Flexible vacation
- 401(k) plan
- Meals on in-office days in the US

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**Apply:** https://hotfix.jobs/jobs/73d569f9-dc4c-4b39-85bd-e143e56c63bd
**Canonical:** https://hotfix.jobs/jobs/73d569f9-dc4c-4b39-85bd-e143e56c63bd