AI Observability & Evals Fullstack Engineer

LangChain; Cambridge (MA); On-site; USD 145,000 - 180,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Flexible vacation

401(k) plan

Meals on in-office days (US)

Job summary

LangChain is seeking a Fullstack Engineer to join LangSmith, our observability and evals platform. You will build features across Go, Python, and React/TypeScript, work closely with enterprise customers and internal teams, and help scale the product for a growing user base.

You will collaborate with product and design to shape the roadmap, maintain high code quality, and ship rapidly with strong ownership. Familiarity with API design and data-intensive applications is a plus.

Qualifications

• 2+ years of experience in software engineering on complex platform products.
• Backend in Go or Python and frontend in React/TypeScript.
• Solid understanding of database systems including PostgreSQL and Redis.

Responsibilities

• Develop and implement key product features across our Go, Python, and TypeScript stack.
• Collaborate with product and design teams to iterate on features and roadmap.
• Drive project timelines while maintaining high engineering standards and writing clean, maintainable code.

Skills

Go/Python backend

React/TypeScript frontend

PostgreSQL

Redis

API design

High-performance systems

Customer collaboration

Job description

LangChain is seeking a Fullstack Engineer to join LangSmith, our observability and evals platform. You will build features across Go, Python, and React/TypeScript, work closely with enterprise customers and internal teams, and help scale the product for a growing user base.

You will collaborate with product and design to shape the roadmap, maintain high code quality, and ship rapidly with strong ownership. Familiarity with API design and data-intensive applications is a plus.