Software Engineer, Agent Harness Organization

Our mission is to automate knowledge work. The first step in our journey is to build the best tool for teams to build agents.

Sim is talent-dense. We’re looking for special people who are mission-driven, passionate, and creative.

About the Role

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.

Diversity, Knowledge Base, Memory Hardware, Software Engineering

$210K-$260K base plus 0.2%-0.8% equity.