Posted by employer 12 months ago
First seen on Joblaze 6 months ago
Last verified on the company career page 5 days ago
Skills & Technologies
Not disclosed in this posting: compensation, years of experience, visa sponsorship.
Joblaze summary
In the role of Software Engineer on the Agent Harness team at Cursor, the individual will focus on developing core functionalities that enhance agent experiences across various products. Key skills include strong software engineering fundamentals and experience with complex agentic systems, as well as a keen understanding of model behaviors and user needs. This position is ideal for someone with a background in building infrastructure for AI products and a passion for innovative coding solutions. Cursor's flat organizational structure fosters a collaborative environment where creative ideas and spirited discussions are encouraged.
Joblaze insights
- Listed about 6 months ago — first seen on Joblaze April 14, 2026. Last confirmed on Cursor's careers page October 21, 2026.
- AI/ML appears in 53% of 481 comparable mid ai/ml roles in United States; Software Engineering appears in 0.6% of 481 comparable mid ai/ml roles in United States.
Quick facts
- Is the Software Engineer, Agent Harness role remote?
- It's hybrid — Cursor expects some on-site time in San Francisco.
- Where is the role based?
- Cursor is hiring for this position in San Francisco.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: AI/ML, Software Engineering.
- What seniority level is this role?
- Cursor targets mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Software Engineer, Agent Harness role at Cursor.
From the original posting
About the Role
As a Software Engineer on the Agent Harness team at SpaceXAI, 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 SpaceXAI 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 performance of AI systems is a plus.
Experience building products or tools used by other engineers is a plus.
Applying
If there appears to be a fit, we'll reach to schedule 2-3 short technicals. After, we'll schedule an onsite in our office, where you'll work on a small project, discuss ideas, and meet the team.
#LI-DNI
Standard company text repeated across Cursor's postings is omitted here.