The opportunity
As a Software Engineer on the Core Services team at SpaceXAI, 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.
What you'll do
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.
You have experience building and operating critical backend services,: especially auth systems, API gateways, or webhook infrastructure.
What they're looking for
- 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.
