Principal Software Engineer, AI Observability & Evals Platform

LangChain
Boston, Cambridge
Workplace: OnsiteFull timeUSD 230,000 - 270,000 annuallyFunction: Software EngineeringExperience: 10+ yearsSkills: ["Python","Go","TypeScript","React","APIs","Architecture","Mentoring","Communication"]

Lead architectural decisions across a Go, Python, and TypeScript stack while delivering end-to-end features for a platform focused on observability, evaluation, and reliability of AI systems. Mentor engineers, raise engineering standards, and drive reliability, tracing, and performance at scale, shaping the product roadmap in collaboration with product and design.

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FursaFursa
LangChain
LangChain
4 months ago

Principal Software Engineer, AI Observability & Evals Platform

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live

Job Summary

Lead architectural decisions across a Go, Python, and TypeScript stack while delivering end-to-end features for a platform focused on observability, evaluation, and reliability of AI systems. Mentor engineers, raise engineering standards, and drive reliability, tracing, and performance at scale, shaping the product roadmap in collaboration with product and design.
Location: Boston, Cambridge
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Sr. Manager level

Key Responsibilities

  • •Drive technical direction by leading architectural decisions across Go, Python, and TypeScript, ensuring scalable and maintainable systems.
  • •Own features end-to-end from backend services and APIs to frontend product experiences, coordinating with product/design to shape the roadmap.
  • •Drive tracing, monitoring, and evaluation workflows at scale with a focus on reliability and performance for high-volume data.
  • •Set engineering standards, lead code reviews, and establish foundational patterns to raise the team’s technical quality.
  • •Mentor engineers across levels, providing design feedback and guidance to enable delivery with high standards.

Pay and Benefits

Salary: USD 230,000 - 270,000 annually
Perks:MedicalDentalVision401kMeal Allowance

Key Requirements

  • •10+ years of professional experience in backend or fullstack engineering on highly complex, production systems.
Experience:10+ yearsAiObservabilityEnterprise software
Skills:PythonGoTypeScriptReactAPIsArchitectureMentoringCommunication
Languages:English
Tech Stack:PythonGoTypeScriptReactPostgreSQLRedisClickHouseAWSGCPAzure

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