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

LangChain· Engineering
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Boston, MA, New York, NY$170k - $235kFull-timePosted 1mo ago

About the role

Senior Backend Engineer role building the backend systems powering LangSmith, LangChain’s observability and evals platform, focused on tracing, monitoring, evaluation workflows, and scalable AI observability.

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 and evaluation data.
  • Ensure system reliability through strong testing, monitoring, and alerting practices.
  • Troubleshoot and resolve production issues, performing root-cause analysis and implementing long-term fixes.
  • Create and maintain technical documentation, including system design and API references.
  • Work closely with full-stack engineers, product managers, and product designers on rolling out new features.

Qualifications

  • 4+ years of professional experience in backend engineering working on highly complex products
  • Proficiency in one or more backend languages/frameworks, ideally Python and/or Go
  • Strong understanding of API design and building reliable data services.
  • Experience with high-throughput, 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) would be a bonus.
  • Strong communication skills, with the ability to collaborate cross-functionally.
  • Customer centricity and ownership mentality

Skills

Required:Backend engineeringAPI design
Nice to have:PythonGoDatabases

Benefits

  • Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.
Last updated Oct 14, 2026. Interested? Apply on the company site.

About LangChain

Engineer reliable agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

AI agentsagent engineeringbrex-fastest-growing-2025liquid-ai-recruiting-targetopen source frameworksplatform
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