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Software Engineer, Agent Harness

Letta· Technical Staff - Engineering
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San FranciscoFull timePosted 11mo ago

About the role

Software Engineer role focused on bridging cutting-edge agent systems with production-grade software to run agents in real applications. Responsible for developing OSS agent framework, cloud service, and defining developer APIs for agents, while contributing to the company’s OSS stack and hosted service.

Responsibilities

  • Develop Letta's OSS agents framework and cloud service
  • Design scalable & resilient backend services and APIs to support Letta Cloud
  • Work with researchers and support bleeding-edge agent architectures in Letta

Qualifications

  • Strong proficiency with Python
  • Strong understanding of how to architect services for security, reliability, and performance
  • Ability to build scalable backend services
  • Strong understanding of SQL databases (Postgres)
  • Familiarity with tooling across the AI stack, such as inference engines (e.g. vLLM, Ollama), and LLM provider APIs (OpenAI, Anthropic)

Skills

Required:PythonBackend architecturePostgreSQLAI tooling
Nice to have:TypeScript / React (bonus)
Last updated Jun 15, 2026. Interested? Apply on the company site.

About Letta

The platform for stateful agents. Build AI agents with long-term memory, advanced reasoning, and custom tools using the Letta API and Agent Development Environment (ADE).

Letta is the platform for building stateful AI agents that can continually learn from experience and evolve over time.

AIAgentsMemoryDevelopment EnvironmentAPISDKs
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