CTO / Technical Co-Founder

Required

• Substantial experience in AI research or post-training, including hands-on preference or reward modeling, RLHF, reinforcement learning, or evaluation of subjective outputs.
• Experience shipping products or features used by people, and owning a model, evaluation, or infrastructure program end to end.
• Strong background in causal inference with observational data, including selection bias, counterfactual or off-policy evaluation, and adaptive experimentation.
• Experience with production ML infrastructure and ads, marketplace, recommender, or ranking systems tied to business outcomes.
• Comfort learning from noisy, delayed, or subjective outcomes and a record of recruiting and leading technical talent.
• Experience with Python and relevant areas such as bandits, sequential allocation, online experimentation, multimodal ML, agents, planning, or hierarchical modeling is valuable.
• Willingness to commit full-time, work on-site in San Francisco, and take equal co-founder responsibility in an early-stage environment.