Software Engineer, Agent Harness

Sim

$210K — $260K *
Consumer Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Strong understanding of large language model (LLM) behavior and infrastructure
  • Experience in building and optimizing workflows and knowledge bases
  • Proficiency in scaling systems to support large user bases (100,000+ users)
  • Ability to conceptualize and implement tool calls and context management
  • Experience in developing reliable systems that recover from failure efficiently

Responsibilities

  • Design and implement workflows for the Sim agent
  • Create and maintain scalable knowledge bases
  • Develop robust systems for tool calls and context management
  • Architect memory functionalities for the agent
  • Ensure reliability and performance at scale

Benefits

  • Equity compensation ranging from 0.2% to 0.8%
  • Opportunity to work on innovative projects
  • Collaboration with a talented team in a dynamic environment
  • Involvement in early-stage product development for cutting-edge technology
Full Job Description
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.

Compensation

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

Applying

If there appears to be a fit, we'll reach out to schedule 1-2 short technicals. After, we'll schedule an onsite in our office, where you'll work on a small project, discuss ideas, and meet the team.

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