Software Engineer, Core Services

Our mission is to automate coding. The first step in our journey is to build the best tool for professional programmers, using a combination of inventive research, design, and engineering. Our organization is very flat, and our team is small and talent dense. We particularly like people who are truth-seeking, passionate, and creative. We enjoy spirited debate, crazy ideas, and shipping code. ### 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. ## 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. ## Applying