Advance state-of-the-art applied science across the three pillars above: embeddings and representation learning, CTR/CVR prediction, multi-objective ranking, auction and bidding dynamics, budget optimization, ROAS optimization, causal measurement, and marketplace balance. You will lead a team of data scientists building the intelligence layer across the full advertising marketplace: (a) Supply-side algorithms; - search, relevance, ranking, real-time bidding, bid-boosting, premium positioning, and dynamic auctions.