Cursor Software Engineer on Core Services team owning shared services like auth, webhooks, and backend systems powering agent workflows. Build reliable, scalable systems critical to developer tools at SpaceXSI.
Responsibilities
Own 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
Build a robust webhook server: handling high-throughput event delivery with proper retry semantics, dead-letter queues, and observability so external integrations just work
Harden SCM integrations: building resilient abstractions over source control providers so Cursor stays rock-solid regardless of third-party conditions
Drive 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
Qualification
Experience with auth systemsCare deeply about clean abstractionsADDITIONAL REQUIREMENTSIf there appears to be a fit
Required
Experience building and operating backend services in production. Experience working with APIs and third-party integrations.
Preferred
Experience with auth systems, API gateways, or webhook infrastructure
Experience working on agentic products or infrastructure and strong opinions on reliability and performance of complex multi-step systems
Care deeply about clean abstractions, well-defined service contracts, and making it easy for other engineers to build on top of your work
Strong software engineering fundamentals and enjoying 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
ADDITIONAL REQUIREMENTS:
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
