Senior Fullstack Engineer, AI Observability & Evals

Candidate; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Equity

Benefits

In-office meals (US)

Job summary

LangChain is seeking a Senior Fullstack Engineer for LangSmith to shape the technical direction of our observability and evals platform, collaborating with enterprise customers and internal stakeholders. You will own critical features across Go, Python, and TypeScript and mentor teammates.

The role emphasizes API design, scalable architectures, and delivering high-quality, maintainable code in a fast-paced environment. Salary and equity reflect seniority in a US-based product team.

Qualifications

• 5+ years of software engineering experience on complex platform products.
• Backend Go or Python with frontend React + TypeScript experience.
• Strong knowledge of PostgreSQL and Redis.
• Experience designing and scaling high-performance APIs.

Responsibilities

• Lead the architecture and implementation of LangSmith features across Go, Python, and TypeScript.
• Collaborate with product and design teams to iterate on new features.
• Mentor junior engineers and drive ambitious project timelines.
• Write clean, well-tested code with a focus on performance.

Skills

Go

Python

React

TypeScript

APIs design

PostgreSQL

Redis

Tools

REST APIs

CI/CD

Terraform

Job description

LangChain is seeking a Senior Fullstack Engineer for LangSmith to shape the technical direction of our observability and evals platform, collaborating with enterprise customers and internal stakeholders. You will own critical features across Go, Python, and TypeScript and mentor teammates.

The role emphasizes API design, scalable architectures, and delivering high-quality, maintainable code in a fast-paced environment. Salary and equity reflect seniority in a US-based product team.