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Software Engineer, Model Lifecycle and Signals

Cursor· SpaceXAI / Model Lifecycle and Signals
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Hybrid (SF / Remote)full-timePosted 4d ago

About the role

Software Engineer on the Model Lifecycle and Signals team at SpaceXAI, building the bridge between frontier models and Cursor products. Own model selection, guardrails, and informing next-generation model learning. Interface across infrastructure, data, and product to bring models from preview to production and derive actionable insights from real-world data.

Responsibilities

  • 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.

Qualifications

  • 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.
  • 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.

Skills

Required:Production system ownershipEvaluation, measurement, or model serving systemsData fluency and collaboration with data scientists
Last updated Oct 22, 2026. Interested? Apply on the company site.
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