Senior Backend Engineer - AI Observability & Evals Platform

LangChain; Cambridge (MA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Flexible vacation

401(k) plan

Meals on in-office days

Job summary

LangChain is seeking a Senior Backend Engineer to join our Boston-based team. You will build the backend systems powering LangSmith, focusing on observability, evaluation, and scalable data services.

The role emphasizes backend feature development with opportunities to engage in frontend and full-stack considerations as needed. Ideal candidates have 4+ years in backend engineering, strong Python/Go API design skills, and experience with high-throughput systems and cloud platforms.

Qualifications

• 4+ years of backend engineering experience.
• Proficiency in Python and/or Go and API design.
• Experience with high-throughput, mission-critical systems and cloud platforms.

Responsibilities

• Design, develop, and maintain backend services and APIs for 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 testing, monitoring, and alerting practices.
• Troubleshoot production issues and implement long-term fixes with root-cause analysis.
• Create and maintain technical documentation including system design and API references.
• Work with full-stack engineers, product managers, and designers to roll out new features.

Skills

Backend engineering

Python

Go

API design

High-throughput systems

Postgres

Redis

Tools

Postgres

Redis

AWS/GCP/Azure

Job description

LangChain is seeking a Senior Backend Engineer to join our Boston-based team. You will build the backend systems powering LangSmith, focusing on observability, evaluation, and scalable data services.

The role emphasizes backend feature development with opportunities to engage in frontend and full-stack considerations as needed. Ideal candidates have 4+ years in backend engineering, strong Python/Go API design skills, and experience with high-throughput systems and cloud platforms.