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Software Engineer, Core Services

Cursor· Core Services / SpaceXAI
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Hybrid (Remote possible with onsite as determined by team needs)Full-timePosted 6mo ago

About the role

Software Engineer on the Core Services team at SpaceXAI, owning critical shared services between product surfaces and the infrastructure layer (auth, webhooks, and backend agent-workflow systems) to enable scalable, reliable developer tools and AI-powered workflows.

Responsibilities

  • 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

  • Experience building and operating critical backend services, especially auth systems, API gateways, or webhook infrastructure.
  • Worked on agentic products or infrastructure with a focus on reliability and performance of complex multi-step systems.
  • Cares deeply about clean abstractions, well-defined service contracts, and enabling other engineers to build on your work.
  • Strong software engineering fundamentals and ownership of 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.

Skills

Required:Backend service design and operation
Nice to have:Authentication/AuthorizationEvent-driven architectures
Last updated Oct 15, 2026. Interested? Apply on the company site.
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