Senior Backend Engineer for AI Observability Platform

langchain; Town of Boston (NY); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical insurance

Dental coverage

Vision coverage

401(k) plan

Flexible vacation

Job summary

LangChain is seeking a Senior Backend Engineer for its LangSmith platform in Boston. You will build backend systems powering tracing, evaluation, and observability for AI applications at scale.

The role emphasizes backend feature development, with valuable exposure to full-stack, performance tuning, and production debugging. Join a team delivering core services, APIs, and data platforms that enable developer teams to monitor and evaluate AI applications.

Qualifications

• 4+ years of professional backend engineering experience.
• Proficiency in Python and/or Go.
• Strong understanding of API design and building reliable data services.
• Experience with high-throughput, mission-critical systems.

Responsibilities

• Design, develop, and maintain backend services and APIs to support LangSmith's tracing, monitoring, and evaluation workflows.
• Collaborate on architectural decisions to ensure systems are performant and maintainable.
• Optimize storage and query performance for high-volume observability data.
• Ensure system reliability through strong testing, monitoring, and alerting practices.
• Troubleshoot production issues and implement long-term fixes.
• Create and maintain technical documentation, including system design and API references.
• Work closely with full-stack engineers, product managers, and designers on rolling out new features.

Skills

Backend engineering

Python

Go

API design

High-throughput systems

Performance optimization

Collaboration

Tools

Postgres

Redis

Clickhouse

AWS

GCP

Azure

Job description

LangChain is seeking a Senior Backend Engineer for its LangSmith platform in Boston. You will build backend systems powering tracing, evaluation, and observability for AI applications at scale.

The role emphasizes backend feature development, with valuable exposure to full-stack, performance tuning, and production debugging. Join a team delivering core services, APIs, and data platforms that enable developer teams to monitor and evaluate AI applications.