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

LangChain
San Francisco, Boston, Cambridge, New York
Workplace: OnsiteFull timeUSD 175,000 - 225,000 annuallyFunction: Software EngineeringExperience: 5+ yearsSkills: ["Communication","Collaboration","Ownership","Troubleshooting","Documentation"]

Senior backend engineer responsible for building and maintaining LangSmith’s observability and evals backend services and APIs, optimizing performance and storage for high-volume data, and collaborating with cross-functional teams to roll out new features across San Francisco, Boston, and New York. Emphasis on reliability, scalability, and thorough documentation.

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FursaFursa
LangChain
LangChain
7 months ago

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

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Source: Company careers pageValidated by: Fursa AI
Last checked: 19 hours agoStatus: Live

Job Summary

Senior backend engineer responsible for building and maintaining LangSmith’s observability and evals backend services and APIs, optimizing performance and storage for high-volume data, and collaborating with cross-functional teams to roll out new features across San Francisco, Boston, and New York. Emphasis on reliability, scalability, and thorough documentation.
Location: San Francisco, Boston, Cambridge, New York
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Sr. Manager level

Key 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.

Pay and Benefits

Salary: USD 175,000 - 225,000 annually
Perks:Health InsuranceDental401k

Key Requirements

  • •5+ years of professional backend engineering experience
  • •Proficiency in Python or Go
  • •Strong understanding of API design and building reliable data services
  • •Experience with high-throughput or mission-critical systems
  • •Experience with database systems (Postgres, Redis, Clickhouse) and cloud platforms (AWS, GCP, Azure)
Experience:5+ yearsAIOpen SourceSaaS
Skills:CommunicationCollaborationOwnershipTroubleshootingDocumentation
Tech Stack:PythonGoAPIsPostgreSQLRedisClickHouseAWSGCPAzure

Company Brief

LangChain
Provides an open-source framework and commercial platform (LangSmith/LangGraph) for building, testing, monitoring, and deploying LLM-powered applications and agentic AI for developers and enterprises.
Industry: Developer Tools
Company Size: Medium (51 to 250 employees)
Revenue: USD 10M to 25M
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series B
Headquarters: San Francisco, United States
Founded: 2022
WebsiteLinkedIn