Senior Backend Software Engineer (Observability)

Location: On-site in San Francisco, CA; Boston, MA; or New York, NY

Annual base salary: $180,000–$240,000

Company

LangChain builds open-source frameworks and a platform for building, evaluating, deploying, and operating AI agents at scale.

What you will do

• Design, develop, and maintain backend services and APIs for LangSmith tracing, monitoring, and evaluation workflows.
• Contribute to architectural decisions that keep systems performant and maintainable.
• Optimize storage and query performance for high-volume observability and evaluation data.
• Improve reliability through testing, monitoring, and alerting practices.
• Troubleshoot production issues, perform root-cause analysis, and implement long-term fixes.
• Collaborate with full-stack engineers, product managers, and product designers while documenting system designs and APIs.

Requirements

• 5+ years of professional backend engineering experience on highly complex products.
• Proficiency in one or more backend languages or frameworks, ideally Python or Go.
• Strong understanding of API design and reliable data services.
• Experience with high-throughput or mission-critical systems and backend performance optimization.
• Experience with Postgres, Redis, ClickHouse, and cloud platforms such as AWS, GCP, or Azure.
• Strong communication, customer centricity, and ownership mentality.

Culture & Benefits

• Meaningful ownership and impact on products and engineering practices.
• Medical, dental, and vision coverage.
• Flexible vacation.
• 401(k) plan and meals on in-office days in the US.
• Variable compensation, equity, and additional benefits may apply depending on the role.