Frontier AI Research Scientist - SimLabs & Evaluation

Stealth AI Startup in the San Francisco Bay Area is seeking PhD graduates for a full-time, on-site role starting around December 2026 or January 2027. You will work onsite at either San Francisco or Sunnyvale, contributing to the data engine, evaluation stacks, and reliability work essential for frontier AI. You will help design ultra-realistic environments, verify model performance, and ship research-driven infrastructure that stress-tests agents across domains.