Fullstack Engineer (AI)

Location: On-site in San Francisco, CA; Boston, MA; or New York, NY

Annual salary: $145,000–$180,000 USD, plus variable compensation, equity, benefits, and perks.

Company

LangChain builds open-source frameworks and commercial platforms for developing, evaluating, deploying, and operating AI agents at scale.

What you will do

• Develop key LangSmith product features across the Go, Python, and TypeScript stack.
• Build functionality for an AI observability and evaluation platform.
• Collaborate with product and design teams to refine features and the product roadmap.
• Work with enterprise customers, developer end-users, and internal stakeholders.
• Deliver projects on aggressive timelines while maintaining clean, maintainable, and well-tested code.

Requirements

• 2+ years of software engineering experience with complex platform products.
• Fullstack experience with Go or Python on the backend and React with TypeScript on the frontend.
• Strong understanding of database systems, particularly Postgres and Redis.
• Experience designing and scaling APIs, preferably for high-performance, data-intensive applications.
• Strong ownership, execution, communication, and collaboration skills.

Nice to have

• Experience with AI/LLM-powered applications, developer tools, or observability platforms.

Culture & Benefits

• Medical, dental, and vision coverage.
• Flexible vacation.
• 401(k) plan.
• Meals on in-office days in the US.
• Meaningful equity and competitive benefits aligned with regional norms for team members in the EU, UK, and APAC.