Hiring: Software Engineer, Agent Harness Company: Sim Location: San Francisco, CA Job Posted Time: 2026-09-15 13:01:37 Employment Type: On-site Target Skills & Keywords : LLM About the job Required Skills: •The agent harness is Sim. It's the agent that builds workflows, tables, creates knowledge bases, and does everyday tasks. As a member of this team, you'll build the agent that builds everything else: how it plans, calls tools, uses memory, recovers from failure, and runs reliably at scale for 100,000+ builders. •You may be a fit if •You can think clearly about LLM behavior (tool calls, context, retries, evals) and you can turn that intuition into robust infrastructure. Compensation: •$210,000 - $260,000 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!