Software Engineer, Core Services

About the Role

As a Software Engineer on the Core Services team, you'll own the critical shared services that sit between our product surfaces and the infrastructure layer: auth, webhooks, and the backend systems that power agent workflows.

You'll build the systems that every product team depends on, ensuring they are reliable, well-abstracted, and ready for whatever comes next.

Example Projects Include

• Owning authentication: designing and implementing a scalable auth architecture that secures one of the most widely-used developer tools in the world.
• Powering the agent backend: owning the infrastructure behind Cursor's agent workflows, optimizing for end-to-end performance and reliability as agents become central to the developer experience.
• Building a robust webhook server: handling high-throughput event delivery with proper retry semantics, dead-letter queues, and observability so external integrations just work.
• Hardening SCM integrations: building resilient abstractions over source control providers so Cursor stays rock-solid regardless of third-party conditions.
• Driving end-to-end agent reliability: partnering with the client and inference teams to improve the full path from user action to agent response, closing the loop on one of the hardest problems in AI-powered development.

Qualifications

You may be a fit if:

• You have experience building and operating critical backend services, especially auth systems, API gateways, or webhook infrastructure.
• You've worked on agentic products or infrastructure and have strong opinions on reliability and performance of complex multi-step systems.
• You care deeply about clean abstractions, well-defined service contracts, and making it easy for other engineers to build on top of your work.
• You have strong software engineering fundamentals and enjoy owning the full lifecycle of production services.
• Experience with authentication/authorization frameworks (OAuth, JWTs, RBAC), event-driven architectures, or building developer-facing platform services is a plus.

Interview Process

If there appears to be a fit, we'll reach out 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.