Software Engineer, Model Routing & Inference

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, capacity planning).

• You have strong software engineering fundamentals and enjoy shipping production systems that handle millions of requests.

• You make good calls in the gray area: weighing reliability, cost, latency, and user experience when there isn't a single "right" answer.

APPLYING

If there appears to be a fit, we'll reach 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.