Founding Harness Engineer

The role

You will develop the runtime and safeguards for an AI coworker. This includes designing agent runtimes, writing system prompts, and building evaluation tests.

What you will do

• Design and build the agent runtime for context gathering, deciding when to act, tool selection, approval, and task completion.
• Write and refine system prompts to encourage useful initiative without noisy or risky behavior.
• Build evaluation and regression tests for real tasks, tool use, and failure cases.
• Improve reliability across long-running work, interruptions, and retries.
• Implement safety boundaries, including approval gates and multi-tenant data separation.
• Work directly with the founding team and early users to shape the product.

Required qualifications

• Production experience shipping tool-using LLM agents, beyond demos or thin prompt wrappers.
• Hands-on system prompt design, with iterative testing and improvement.
• 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 across prototyping and production, with the ability to explain technical tradeoffs.
• Experience with LLM agents, tool use, evaluation, and prompt engineering.

Benefits

• Founding equity is available

About the company

clera is an early-stage AI company building an AI coworker for teams.