← All roles

Senior Software Engineer, Database (SmithDB)

LangChain· Engineering
Apply on company site
San Francisco, CA$185k - $250kFull-timePosted 5mo ago

About the role

SmithDB is LangChain's internal database team building a storage and query layer for AI observability and evaluation. This role focuses on designing, optimizing, and hardening a greenfield distributed database system to handle trillions of agent traces, with Rust-based development, Kubernetes deployment, and tight integration with cloud object stores.

Responsibilities

  • Engineer performant Rust code for ingestion and query execution
  • Optimize for cost and speed, heavily utilizing memory and CPU profiling
  • Integrate tightly with cloud object stores (S3/GCS/Azure Blob)
  • Deploy our distributed database services on Kubernetes (multi-tenant, high throughput, low latency)
  • Contribute to observability for the storage engine itself (metrics, tracing, debug tooling)

Qualifications

  • 5+ years in systems/database engineering with strong experience in a systems programming language (Rust, C++). Rust strongly preferred, as it is the language we use.
  • Knowledge of database internals is a plus: query engines, storage systems, indexing, and compaction
  • Proficiency in systems performance analysis: memory allocation, CPU hotspots, lock contention, async runtimes.
  • Familiarity with similar query execution engines is a plus
  • Experience with Kubernetes, distributed systems, and cloud object storage is a plus.
  • Strong fundamentals in networking, OS concepts, and systems debugging.

Skills

Required:RustPerformance profiling
Nice to have:C++Database internalsKubernetesCloud object storage

Benefits

  • medical, dental, and vision coverage
  • flexible vacation
  • a 401(k) plan
  • meals on in-office days in the US
  • and more
Last updated Oct 14, 2026. Interested? Apply on the company site.

About LangChain

Engineer reliable agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

AI agentsagent engineeringbrex-fastest-growing-2025liquid-ai-recruiting-targetopen source frameworksplatform
Company profileWebsite

More open roles at LangChain