LangChain
Senior Backend Software Engineer, AI Observability & Evals Platform (LangSmith)
$170K–$235K
Boston, MA +1 · On-site · Senior · Full-time · Posted Sep 12, 2026
- Location
- Boston, MA
New York, NY - Experience
- 4+ years of professional experience in backend engineering working on highly complex products.
About the job
Builds backend systems and APIs for LangSmith’s AI observability and evaluation platform, enabling customers to monitor and evaluate AI applications at scale.
What you'll do
- Design, develop, and maintain services and APIs for tracing, monitoring, and evaluation workflows.
- Improve performance, reliability, and maintainability, including optimizing storage and queries for high-volume data.
- Troubleshoot production issues, implement long-term fixes, and collaborate on feature launches and technical documentation.
What they ask for
- Proficiency in one or more backend languages or frameworks.
- Strong understanding of API design and reliable data services.
- Experience with high-throughput, mission-critical systems.
- Demonstrated ability to optimize backend services for performance and reliability.
Nice to have
- Familiarity with fullstack or frontend engineering, performance tuning, and production debugging.
- Experience with Postgres, Redis, Clickhouse, or AWS, GCP, Azure.
Pay
$170,000- $235,000 USD base salary
Tools
Python, Go, Postgres, Redis, Clickhouse, AWS, GCP, Azure
AI focus
Builds observability, tracing, monitoring, and evaluation systems for AI applications.
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