Co-Founder & CTO — AI Platform, Equity, SF On-site

Wwshemi; San Francisco (CA); On-site; USD 180,000 - 270,000; Full time

Benefits offered by this job

Equity

Job summary

Wwshemi is seeking an on-site Chief Technology Officer to define and drive the technical and research strategy for an early-stage creative AI and advertising platform in San Francisco. You will shape the architecture, lead the initial engineering and research teams, and own the platform from data pipelines to model evaluation and deployment.

You will own models, experimentation, and productization decisions, collaborating with creators and brands while building robust infrastructure for

Qualifications

• Extensive experience in AI research or post-training, including preference/reward modeling, RLHF, reinforcement learning, or evaluation of subjective outputs.
• Experience shipping products or features used by people, owning a model/evaluation/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 track record of recruiting and leading technical talent.
• Experience with Python and areas like bandits, sequential allocation, online experimentation, multimodal ML, agents, planning, or hierarchical modeling.

Responsibilities

• Set technical and research strategy, evolving workflows into a proprietary training/evaluation platform.
• Build data infrastructure connecting briefs, submissions, generation traces, decisions, critiques, and campaign outcomes.
• Develop systems to evaluate, rank, critique, generate, and improve creative work.
• Design budget allocation policies that guide campaigns and data collection.
• Choose approaches across frontier models, fine-tuning, post-training, RL, and original research.
• Build reliable infrastructure for creator workflows, campaigns, experimentation, training, and inference.
• Establish standards for data quality, consent, privacy, measurement, and model evaluation.
• Recruit and lead the first engineering and research team, working with creators/brands.

Job description

Wwshemi is seeking an on-site Chief Technology Officer to define and drive the technical and research strategy for an early-stage creative AI and advertising platform in San Francisco. You will shape the architecture, lead the initial engineering and research teams, and own the platform from data pipelines to model evaluation and deployment.

You will own models, experimentation, and productization decisions, collaborating with creators and brands while building robust infrastructure for