Software Engineer, Agent Harness
Builds core agent harness platform for agent orchestration, tools, guardrails, and model tuning powering Cursor products. Requires strong software engineering skills, experience with complex agentic systems, and judgment for model choices under constraints.
About the job
Responsibilities
- Build core agent behavior and capabilities powering agent experiences across Cursor products, including agent orchestration, tools, guardrails, and model behavior tuning.
- Design as a platform that Cursor engineers can extend and depend on.
- Define default Cursor agent experience (“Auto”), making smart model choices based on user needs, capabilities, and cost.
- Advance agent harness (agent loop, tools, prompts, execution environment, capabilities).
- Improve “Auto” model setting.
- Launch new models end-to-end, partnering with model providers and research team on integration, evaluation, and rollout.
Requirements
- Built complex agentic products or infrastructure with taste and strong opinions on model and agent behaviors.
- Strong software engineering fundamentals and experience shipping production systems.
- Good judgment in gray areas, weighing data, user experience, and product taste.
Nice-to-Haves
- Experience building products or tools used by other engineers.
Skills
Python, Agent Orchestration, LLMs, Prompt Engineering, Model Evaluation, TypeScript, React, Kubernetes, Infrastructure, Production Systems
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