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

LangChain
Boston, New York
Workplace: OnsiteFull timeUSD 180,000 - 240,000 annuallyFunction: Software EngineeringExperience: 4+ yearsSkills: ["Communication","Cross-functional collaboration","Ownership mentality","Customer centricity","Troubleshooting"]

Build and maintain the backend services and APIs that power LangSmith’s observability and evaluation workflows. You’ll design and optimize performant systems for high-volume tracing, monitoring, and eval data, improve reliability through testing/alerting, and lead root-cause fixes for production issues. Collaborate with full-stack engineers, product managers, and designers while creating technical documentation and API references.

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FursaFursa
LangChain
LangChain
6 hours ago

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

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Source: Company careers pageValidated by: Fursa AI
Last checked: 1 hour agoStatus: Live

Job Summary

Build and maintain the backend services and APIs that power LangSmith’s observability and evaluation workflows. You’ll design and optimize performant systems for high-volume tracing, monitoring, and eval data, improve reliability through testing/alerting, and lead root-cause fixes for production issues. Collaborate with full-stack engineers, product managers, and designers while creating technical documentation and API references.
Location: Boston, New York
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Design, develop, and maintain backend services and APIs for LangSmith 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 reliability with strong testing, monitoring, and alerting practices
  • •Troubleshoot production issues using root-cause analysis and implement long-term fixes

Pay and Benefits

Salary: USD 180,000 - 240,000 annually
Equity and Bonus:Equity
Perks:MedicalDentalVision401kMeal Allowance

Key Requirements

  • •4+ years of professional backend engineering experience on 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 and optimizing for performance and reliability
  • •Experience with database systems (Postgres, Redis, Clickhouse) and cloud platforms (AWS, GCP, Azure)
Experience:4+ yearsAIObservabilityEvaluationsOpen sourceSaaS
Skills:CommunicationCross-functional collaborationOwnership mentalityCustomer centricityTroubleshooting
Tech Stack:PythonGoAPIsPostgresRedisClickhouseAWSGCPAzure

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