Software Engineer, AI Agent Harness & Platform

Cursor; San Francisco, New York (CA, NY); On-site; USD 180,000 - 230,000; Full time

Job summary

Cursor in San Francisco seeks a Software Engineer for the Agent Harness team. You’ll build core agent behavior and capabilities powering experiences across Cursor products, including agent orchestration, tools, guardrails, and model tuning—designed as a platform SpaceXAI engineers can extend.

Your work will define the default Cursor agent experience ("Auto"), where users rely on smart model choices under real-world constraints, balancing performance and cost with trust.

Qualifications

• Built complex agentic products or infrastructure.
• Strong software engineering fundamentals and production systems.
• Experience with models and agent behaviors, and staying updated on AI research.

Responsibilities

• Build core agent behavior and capabilities powering Cursor products.
• Develop agent orchestration, tools, guardrails, and model tuning as a platform for SpaceXAI integrations.
• Shape the default Cursor agent experience and smart model choices under real-world constraints.

Skills

Agentic products

Software engineering

Model behavior

Model eval datasets

Research awareness

Product tool development

Cross‑team collaboration

Job description

Cursor in San Francisco seeks a Software Engineer for the Agent Harness team. You’ll build core agent behavior and capabilities powering experiences across Cursor products, including agent orchestration, tools, guardrails, and model tuning—designed as a platform SpaceXAI engineers can extend.

Your work will define the default Cursor agent experience ("Auto"), where users rely on smart model choices under real-world constraints, balancing performance and cost with trust.