Senior Backend Software Engineer, Observability & Evals Platform (LangSmith) – LangChain – Jobs in Cambridge, MA | OpenJobs AI

Job Details

Overview Company

Senior Backend Software Engineer, Observability & Evals Platform (LangSmith)

$175k/y-$225k/y

LangChain

2 days ago

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OnsiteFull-timeSenior

Summary

LangChain is seeking a Senior Backend Software Engineer for their Observability & Evals Platform, located in San Francisco, Boston, or New York. The role focuses on building backend systems that support monitoring and evaluating AI applications.

About the Role

As a Senior Backend Engineer, you will design, develop, and maintain backend services and APIs for LangSmith's tracing, monitoring, and evaluation workflows. You will collaborate on architectural decisions, optimize performance for high-volume data, ensure system reliability, troubleshoot production issues, and create technical documentation.

About You

Required:

5+ years of professional experience in backend engineering.
Proficiency in one or more backend languages/frameworks, ideally Python or Go.
Strong understanding of API design and building reliable data services.
Experience with high-throughput or mission-critical systems.
Demonstrated ability to optimize backend services for performance and reliability.
Experience with database systems (Postgres, Redis, Clickhouse) and cloud platforms (AWS, GCP, Azure).
Strong communication skills and ability to collaborate cross-functionally.
Customer centricity and ownership mentality.

Benefits

Competitive compensation including base salary and meaningful equity.
Health and dental coverage.
Flexible vacation.
401(k) plan.
Life insurance.

LangChain

LangChain is the platform for building reliable agents. Our products power top engineering teams — from fast-growing startups like Lovable, Mercor, and Clay to global brands including AT&T, Home Depot, and Klarna. LangGraph is a low-level orchestration framework for building controllable agents and long-running workflows. It’s used in production by teams at Replit, Uber, LinkedIn, GitLab, and more. LangSmith offers unified evaluation and monitoring to help developers debug, evaluate, and improve their agents at scale. LangChain provides hundreds of integrations and composable components, making it easy to connect with the latest models, tools, and databases — with minimal engineering overhead. Together, these tools help teams build, deploy, and manage enterprise-grade agents, faster.

Cambridge, MA