Boston-Based Senior Backend Engineer, AI Observability

Precision Labs; Boston (MA); Hybrid; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision coverage

401(k) plan

In-office meals

Job summary

LangChain in Boston, MA is seeking a Senior Backend Engineer to join our growing engineering team. You will build backend systems powering LangSmith, LangChain’s observability and evaluation platform, focusing on core services for monitoring and evaluating AI applications at scale.

You will collaborate with frontend and product teams, optimize for performance and reliability, and contribute to API design and system documentation.

Qualifications

• 4+ years of professional experience in backend engineering on highly complex products.
• Proficiency in 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).
• Strong communication skills and cross-functional collaboration.
• Customer centricity and ownership mentality.

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 testing, monitoring, and alerting practices.
• Troubleshoot production issues and perform root-cause analysis with long-term fixes.
• Create and maintain technical documentation including system design and API references.
• Work with full-stack engineers, product managers, and designers on rolling out new features.

Skills

Backend engineering

Python

Go

API design

Databases

Cloud platforms

Communication

Customer focus

Job description

LangChain in Boston, MA is seeking a Senior Backend Engineer to join our growing engineering team. You will build backend systems powering LangSmith, LangChain’s observability and evaluation platform, focusing on core services for monitoring and evaluating AI applications at scale.

You will collaborate with frontend and product teams, optimize for performance and reliability, and contribute to API design and system documentation.