The opportunity
As a Software Engineer on the Model Lifecycle and Signals team at SpaceXAI, you'll own the bridge between frontier models and every user facingCursor product, used at a scale few teams ever see. You'll decide when we use which model, spot where models go off track and build the…
What you'll do
Get new frontier models into users' hands the day they're ready, and retire old ones without anyone noticing.
Evaluate internal and external preview models before launch and give: meaningful feedback to the teams building them.
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: puts them to work: signals that show where each model shines, where it goes off track, and what 'better' actually means.
You're an exceptional engineer with a track record of shipping production: systems people rely on. You own problems end to end, and you'd rather automate a painful process than repeat it.
You've built and operated evaluation, measurement, or model serving systems,: such as AI evals, experimentation, ranking/relevance, or routers. You can turn ambiguous "quality" questions into concrete metrics, pipelines, and decisions.
What they're looking for
- You're fluent with data and can collaborate effectively with data scientists and researchers.
- You have strong taste and real curiosity about model and agent behavior. You: try new models the day they come out and have opinions about where each one shines.
