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

LangChain· Engineering
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San Francisco, CA, Boston, MA, New York, NY$180k - $240kFull-timePosted 11mo ago

About the role

Senior Backend Engineer to build LangSmith observability, evaluation, and production reliability platform backend services. Focus on backend feature development with potential collaboration with full-stack/ frontend, performance tuning, and production debugging.

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

  • 5+ years of professional experience in backend engineering working on highly complex products
  • 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, with the ability to collaborate cross-functionally
  • Customer centricity and ownership mentality

Skills

Required:Backend developmentAPI designDatabase systemsCloud platformsPerformance optimization
Nice to have:PythonGo

Benefits

  • 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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