Software Engineer, Model Lifecycle and Signals

The role

You will own the bridge between frontier models and user-facing Cursor products. You will decide model usage, build guardrails, and partner with research and product teams to improve models and products.

What you will do

• Get new frontier models into users' hands and retire old ones
• Evaluate internal and external preview models before launch
• Build Cursor Router to decide which model handles each request
• Build signals and an experimentation platform to monitor model performance

Required qualifications

• Bachelor's degree in computer science, engineering, math, or scientific discipline; OR 2+ years of professional experience building software in lieu of a degree
• Must be able to work in person at the New York or San Francisco office

Nice to have

• Track record of shipping production systems people rely on
• Owning problems end to end
• Automating painful processes rather than repeating them
• Experience building and operating evaluation, measurement, or model serving systems, such as AI evals, experimentation, ranking/relevance, or routers
• Ability to turn ambiguous quality questions into concrete metrics, pipelines, and decisions
• Fluency with data and the ability to collaborate effectively with data scientists and researchers
• Taste and real curiosity about model and agent behavior

Benefits

• Equity
• Comprehensive medical, vision, and dental coverage
• Access to a 401(k) retirement plan
• Short & long-term disability insurance
• Life insurance
• Various other discounts and perks

About the company

SpaceXSI is building Super Intelligence to help humanity understand the universe. They are building the full Super Intelligence stack including Colossus supercomputers, Grok models, and a suite of applications.