Software Engineer, Model Lifecycle and Signals
Cursor · New York
About this role
## About SpaceX AI SpaceX was founded with the belief that humanity exploring the stars is more exciting than staying grounded. Today, SpaceX is building the technologies to make life multiplanetary and expand consciousness to the stars. SpaceXSI is building **Super Intelligence** to help humanity understand the universe—building the full stack from **Colossus supercomputers** to **Grok models** and a suite of applications (including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X). The teams are creating a flywheel where better compute leads to better models, which power more useful products, and real-world learnings shape what gets built next. --- ## Role: Software Engineer — Model Lifecycle and Signals As a Software Engineer on the **Model Lifecycle and Signals** team at SpaceX AI, you’ll own the bridge between **frontier models** and **every user-facing Cursor product** at a scale few teams ever see. You’ll decide **which model to use and when**, spot where models go off track, and build **guardrails** to keep them aligned. You’ll also help shape what the next generation of models should learn. This role sits at the intersection of **infrastructure, data, and product**. You’ll bring models from **preview to production**, analyze real-world data to understand what’s working, and partner with **research, inference, product, and data science** teams to turn evidence into better products and better models. --- ## What you’ll work on - Get new frontier models into users’ hands the day they’re ready, and retire old ones seamlessly. - Evaluate internal and external preview models before launch and provide meaningful feedback. - Build **Cursor Router**: decide which model handles each request, balancing **quality, speed, and cost** at massive scale. - Build the **eyes and ears** of the product and the experimentation platform that powers them—signals that show where each model shines, where it goes off track, and what “better” actually means. --- ## You may be a fit if - You’re an exceptional engineer with a track record of shipping production systems people rely on. - You own problems end-to-end and prefer automating painful processes over repeating them. - You’ve built and operated evaluation, measurement, or model serving systems (e.g., AI evals, experimentation, ranking/relevance, routers). - You can translate ambiguous “quality” questions into concrete **metrics, pipelines, and decisions**. - You’re fluent with data and collaborate effectively with data scientists and researchers. - You have strong taste and real curiosity about model and agent behavior—try new models early and form informed opinions about where each one shines. --- ## Applying If there appears to be a fit, you’ll be contacted to schedule **2–3 short technical interviews**. After that, you’ll have an **onsite** where you’ll work on a small project, discuss ideas, and meet the team. **#LI-DNI**
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