RefolkCandidates
JobsBuild my resume

Software Engineer, Agent Harness

Cursor · San Francisco

$140k - $205k/yrMid levelEngineeringEngineeringFoundationsPosted 9 months ago
Apply with a tailored resumeView the original posting

About this role

Our mission is to automate coding. The first step in our journey is to build the best tool for professional programmers, using a combination of inventive research, design, and engineering. Our organization is very flat, and our team is small and talent dense. We particularly like people who are truth-seeking, passionate, and creative. We enjoy spirited debate, crazy ideas, and shipping code. ABOUT THE ROLE As a Software Engineer on the Agent Harness team at Cursor, you’ll build the core agent behavior and capabilities that power agent experiences across Cursor products. This spans agent orchestration, tools, guardrails, and model behavior tuning - designed as a platform that Cursor engineers can extend and depend on. Your work will also define the default Cursor agent experience (”Auto”), where users trust us to make the right model choices under real-world constraints. Example projects include: - Advancing the agent harness (agent loop, tools, prompts, execution environment, capabilities) used across Cursor products. This would shape and empower experiences like multi-agent coordination. - Improving the default Cursor agent experience (the “Auto” model setting): making smart model choices based on user needs, model capabilities, and cost appetite. - Shaping the default Cursor agent’s personality. - Launching new models on Cursor end-to-end - partnering with foundational model providers and our research team on integration, evaluation, and rollout. YOU MAY BE A FIT IF - You have built complex agentic products or infrastructure. - You have strong software engineering fundamentals and enjoy shipping production systems. - You have taste and strong opinions on model and agent behaviors. You stay up-to-date and informed on emerging research and industry trends. - You make good calls in the gray area: weighing data, user experience, and product taste when there isn’t a single “right” answer. - Experience building eval datasets or frameworks to understand and improve the p

Excerpt from the posting Cursor published. Read the full description on their site before applying.

About Cursor

Cursor is an AI editor and coding agent. Describe what you want to build or change in natural language and Cursor will write the code for you.

All 120 openings at Cursor

Apply to this role, tailored

Queue Software Engineer, Agent Harness at Cursor and I will read the posting, rewrite your resume against it, draft the cover letter, and score the fit before you send anything.

Applications finish as drafts. Nothing is sent until you read it and press send. New accounts start with 500 free credits.

Tailor my applicationHow it works

More roles at Cursor

See all

Similar roles elsewhere

See more

Listed from the job board Cursor publishes. Refolk is not the employer and does not handle their hiring. Applications go to Cursor directly.