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

Job Description

Design, build, and maintain backend services and APIs for LangSmith’s tracing, monitoring, and evaluation workflows, while improving performance and reliability for high-volume data. Troubleshoot production issues, document systems, and collaborate with engineering, product, and design teams to deliver features.

Requirements: Candidates need 4+ years of backend engineering experience with complex products, proficiency in a backend language such as Python or Go, and strong API and reliable data-service design skills. Experience with mission-critical systems, performance and reliability optimization, and cross-functional communication is expected; database and cloud-platform experience is a bonus.

Key Skills: Backend Engineering, Python, Go, API Design, Backend Services, Data Services, High-Throughput Systems, Performance Optimization, Reliability Engineering, PostgreSQL, Redis, ClickHouse, Cloud Platforms, Production Troubleshooting, Root-Cause Analysis, Cross-Functional Collaboration

Benefits: Medical Coverage, Dental Coverage, Vision Coverage, Flexible Vacation, 401(k) Plan, Meals On In-Office Days, Equity