Founding Harness Engineer

The role

You will build the agent runtime and evaluation systems for an AI coworker. You will design tool selection, approval workflows, and safeguards to ensure reliable agent behavior in team workflows.

What you will do

• Design and build the agent runtime for providing context, selecting tools, requesting approvals, and completing work.
• Write and refine system prompts to make agent behavior proactive without becoming noisy or unsafe.
• Build evaluation and regression tests for real tasks, tool use, and failure cases.
• Improve reliability across long-running tasks, interruptions, and retries.
• Implement safeguards such as approval gates and multi-tenant data separation.
• Work directly with the founding team and early users to take broad problems from prototype to production.

Required qualifications

• Production experience shipping tool-using LLM agents, beyond demos or thin prompt wrappers.
• Hands-on system prompt design, improved through testing and iteration.
• Experience building evaluation and regression test harnesses for LLM or agent behavior.
• Understanding of safe tool execution, approval workflows, and multi-user data risks.
• Strong ownership of broad technical problems and the ability to explain tradeoffs.
• Experience with LLM agents, tool use, evaluations, and prompt engineering.

Benefits

• Founding equity is offered

About the company

clera is an early-stage AI team.