Software Engineer, Model Routing & Inference

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. About the Role As a Software Engineer on the Model Routing & Inference team at SpaceXAI, you'll build the inference platform that powers every AI interaction in the product. This team owns the full inference path: making Cursor's AI faster, more reliable, and more cost-effective at a scale few teams in the world get to operate at. Every agent session, every tab completion, and every chat message flows through your stack. Example projects include... Building and evolving our inference gateway, a single abstraction over every provider's API semantics, so model onboarding becomes a config change. Designing intelligent cross-provider failover so no single provider outage causes user-visible degradation. Designing routing backpressure and admission control so traffic spikes don't cascade into providers. You may be a fit if You have deep experience building high-throughput, low-latency distributed systems, especially in inference serving, traffic routing, or real-time data pipelines. You're comfortable reasoning about cost/performance tradeoffs at scale (GPU utilization, provider economics, cap