This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Machine Learning Scientist 5 - Ads Bidding based in United States. This role offers the opportunity to shape machine learning systems at the intersection of advertising, optimization, and large-scale personalization. You will design intelligent bidding algorithms that improve advertiser outcomes while supporting a high-quality member experience. The position combines advanced ML research with hands-on production deployment using large-scale real-world data. You’ll tackle complex challenges involving marketplace dynamics, seasonality, distribution shifts, and optimization. Working closely with product and cross-functional teams, you’ll influence bidding objectives, auction design, and business strategy. Your work will directly contribute to the evolution of a sophisticated, data-driven advertising ecosystem. The environment values rigorous experimentation, strong technical judgment, collaboration, and measurable impact.