Skip to content
CursorCursorSan Francisco, CA

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.

Salary not listed
On-siteFullstack Engineering

About the role

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

PythonAgent OrchestrationLLMsPrompt EngineeringModel EvaluationTypeScriptReactKubernetesInfrastructureProduction Systems
Cape

Full Stack Software Engineer

CapeNew York, NY

Full Stack Software Engineer building privacy-first websites, landing pages, and scalable backend systems for a secure mobile carrier. Focus on resilient connectivity, signaling firewalls, threat detection, and privacy-conscious features using TypeScript/React and Go. Requires 4+ years experience and strong UX intuition.

180k – 235k/yr
Hybrid4+ YOEFullstack Engineering
TheGuarantors

Software Engineer

TheGuarantorsNew York, NY +7

Senior Software Engineer building scalable backend services and modernizing a monolithic platform to microservices for a fintech company's deal flow and underwriting systems. Requires 5+ years experience with Node.js/NestJS, TypeScript, Go, APIs, and distributed systems.

170k – 195k/yr
Remote5+ YOEFullstack Engineering
Mercor

Product Engineer, Talent Experience

MercorSan Francisco, CA

Build and ship polished full-stack features with frontend emphasis across multiple product surfaces for Mercor's AI talent platform. Requires 2-5+ years experience, strong React/TypeScript skills, full-stack capability, and comfort with AI coding tools in a fast-paced onsite environment.

130k – 500k/yr
On-site5+ YOEFullstack Engineering
Mercor

Fullstack Engineer, Assesment

MercorSan Francisco, CA

Build and own backend-heavy full-stack systems for Mercor's assessment platform, designing evaluation pipelines that combine human judgment with AI-powered scoring for vetting top AI talent. Requires 3+ years professional software engineering experience with strong backend fundamentals and comfort across the stack.

130k – 500k/yr
On-site3+ YOEFullstack Engineering
ZoomInfo

Software Engineer III

ZoomInfoBethesda, MD

Full-stack Software Engineer building customer-facing features and AI-powered tools for sales conversation analytics. Requires 3-6 years experience with either backend (Python/Node.js) or frontend (React/Angular) proficiency plus eagerness to work across the stack, databases, and search tech.

112k – 176k/yr
Hybrid3+ YOEFullstack Engineering