Software Engineer, Agent Harness
Sim · San Francisco · $210k–$260k
The role
Sim is seeking a Software Engineer to join the Agent Harness team. The role involves building the core agent that creates workflows, tables, and knowledge bases, focusing on planning, tool calls, memory, failure recovery, and reliability at scale. The position offers a competitive base salary and equity.
- Pay
- $210k–$260k
- Location
- San Francisco
- Work mode
- Onsite
What we know that the posting doesn’t say
- Seen 2 days agostill listed on the employer’s careers page
- Posted 30 days agothe first time we saw it
About Sim
Sim is building a tool for teams to create agents, with the mission to automate knowledge work.
What you would do
- Build the agent that creates workflows, tables, and knowledge bases
- Develop agent planning, tool calling, and memory systems
- Implement failure recovery mechanisms for the agent
- Ensure reliable operation at scale for over 100,000 builders
- Turn understanding of LLM behavior into robust infrastructure
Must have
- Think clearly about LLM behavior including tool calls and context
- Understand retries and evals in LLM systems
- Turn LLM intuition into robust infrastructure
Key skills
- llm
- infrastructure
- tool calling
- evals
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…
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