Clera

Founding Harness Engineer

San Francisco
Salary
$0 - $200,000 annually
Level
Mid
Work type
On-site · San Francisco

Not stated in the posting: visa.

Open. First seen 6 November 2026.

Apply on the company's site →

About the role

About the Role

Join an early-stage AI company building an AI coworker for teams. You will develop the runtime and safeguards that help AI agents take useful initiative, work reliably, and handle real tasks safely.

What You'll 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, and catch regressions as prompts change.
  • 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.

What We're Looking For

  • 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.

Compensation & Benefits

Salary range: $0 to $200,000 USD annually. Founding equity is available; percentage and vesting details are to be determined.

Location

On-site in San Francisco, United States. Candidates should be based in the Bay Area or willing to relocate.

What this role asks for

Particular to this role

Prompt Engineering

Rare in Clera's other 299 open postings.

Compared with Clera's other open jobs.

The team: Engineering HIRES STEADILY

This role is one of 358 open in Engineering. 226 were posted in the last 30 days and the oldest in March: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

LLM (180 of 358), TypeScript (177 of 358), React (154 of 358), Python (146 of 358), Machine Learning (74 of 358), Supabase (73 of 358), PostgreSQL (68 of 358)

OTHER ROLES ON THIS TEAM

From the team and dates on Clera's own job board.

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