Founding Harness Engineer - AI Agents (US only)

Description: Join an early-stage startup building an AI coworker that integrates into everyday tools. Role involves building the agent runtime, managing context, tool choice, and user interactions. Requirements: Proven experience shipping tool-using LLM agents to real users in production. Strong backend skills in Python or TypeScript, with experience in async jobs and state management. Ability to build eval and regression suites for LLM behavior. Excellent communication skills to explain technical concepts to non-technical stakeholders. Understanding of safe tool execution, prompt injection, and multi-tenant data risk. Benefits: Competitive compensation and equity. Direct access to the founder and early users, fostering a collaborative environment. Remote work flexibility across the US, with preferred hours overlapping Pacific time. Opportunity to shape product behavior and take ownership of the agent harness.