Sim
Software Engineer, Agent Harness
$190K–$250K
San Francisco · On-site · Full-time · Posted Aug 26, 2026
- Experience
- New graduates are welcome; projects, internships, and independent work count.
- Visa sponsorship
- Sim sponsors visas.
About the job
Build and improve Sim’s agent harness, which uses company knowledge graphs to create and operate reliable AI agents.
What you'll do
- Own context retrieval, planning and execution, tool use, memory, and failure recovery.
- Build evaluations and use production traces to improve agent behavior.
- Diagnose failures and use evidence to guide harness architecture and future capabilities.
What they ask for
- Ability to reason about agents’ use of company context, including knowledge graphs, tool calls, memory, and context management.
- Ability to design evaluations and diagnose failures across retrieval, model behavior, and execution.
- Ability to use evidence to improve task quality, latency, and cost.
Pay
$190K–$250K USD base salary
Tools
knowledge graph
AI focus
Develop and evaluate autonomous AI agents that use company knowledge to build and operate agents and workflows.
Model-written summary · the original posting is authoritative