Agent Harness Engineer - Core Runtime

You will report to the engineering lead for agent infrastructure and will have ownership in these areas:

Research, design, and build the core run loop and orchestration that power autonomous agents

Define how agents manage context, recover from errors, and hand off work cleanly

Build rapid prototypes and proof of concepts to turn harness ideas into shipped product capabilities

Stay up-to-date with agent architectures from research and industry, and fold the best ideas into our runtime

Design self-healing mechanisms so agents degrade gracefully instead of failing hard

Collaborate with cross-functional teams including applied science, product, and integrations

You have built an agent framework, workflow engine, or long-running job system before

You care about reliability the way SREs do, and you instrument everything

You can reason about non-determinism in LLM outputs and design around it

Experience with sandboxing, containerization, or secure code execution

You move fast on prototypes but know when to harden them for scale

This is a chance to build the foundation that every one of our agents runs on. The harness is where autonomy is won or lost, and you will own it end to end alongside a team that values engineering rigor and scientific curiosity.