Senior Fullstack Engineer for AI Observability Platform

LangChain; Cambridge (MA); On-site; USD 175,000 - 240,000; Full time

Benefits offered by this job

Medical coverage

Dental coverage

Vision coverage

Flexible vacation

401(k) plan

Meals on in-office days in the US

Job summary

LangChain is seeking a Senior Fullstack Engineer to join LangSmith onsite in Boston, MA. You will shape the technical direction of our platform and collaborate with enterprise customers and cross-functional teams to deliver scalable features.

You will work across Go, Python, and TypeScript, design and scale APIs, and own meaningful parts of the product while shipping high-quality code and mentoring teammates.

Qualifications

• 5+ years of software engineering on complex platform products.
• Backend: Go or Python with React + Typescript frontend.
• Databases: Postgres and Redis.
• Experience designing and scaling APIs for high-performance, data-intensive apps.
• Get-stuff-done attitude, strong collaboration with stakeholders.
• Strong ownership mindset and ability to ship quickly.
• Bonus: AI/LLM-powered apps, developer tools, or observability experience.

Responsibilities

• Lead the technical architecture and implementation of key features for LangSmith across Go, Python, and TypeScript stack.
• Collaborate with product and design to iterate on new features.
• Drive project timelines while maintaining high engineering standards.

Skills

5+ years experience

Go

Python

React

Typescript

Postgres

Redis

API design

Communication

Ownership

Delivery

AI/LLM experience

Job description

LangChain is seeking a Senior Fullstack Engineer to join LangSmith onsite in Boston, MA. You will shape the technical direction of our platform and collaborate with enterprise customers and cross-functional teams to deliver scalable features.

You will work across Go, Python, and TypeScript, design and scale APIs, and own meaningful parts of the product while shipping high-quality code and mentoring teammates.