Software Engineer, Model Lifecycle & Signals

Speedrun Talent Network; New York (NY); On-site; USD 150,000 - 230,000; Full time

Job summary

SpaceXAI is seeking a Software Engineer for the Model Lifecycle and Signals team in New York. You will bridge frontier models and user-facing Cursor products, deciding when to use which model and building guardrails to keep models on track at scale.

You will work at the intersection of infrastructure, data, and product, bringing models from preview to production, analyzing real-world data, and collaborating with research, inference, product, and data science teams to improve products and models.

Qualifications

• Shipping production systems people rely on.
• Experience with evaluation, measurement, or model serving systems such as AI evals, experimentation, ranking/relevance, or routers.

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.

Skills

Production systems

End-to-end ownership

Data collaboration

Job description

SpaceXAI is seeking a Software Engineer for the Model Lifecycle and Signals team in New York. You will bridge frontier models and user-facing Cursor products, deciding when to use which model and building guardrails to keep models on track at scale.

You will work at the intersection of infrastructure, data, and product, bringing models from preview to production, analyzing real-world data, and collaborating with research, inference, product, and data science teams to improve products and models.