Do you ever struggle to explain your work? How's this: "Do you shop at Amazon?" Every day, tens of millions of customers visit Amazon to discover, research, and buy products. Millions of interactions are processed each hour, as customers navigate and explore our vast selection of products, features, and services around the world. The Amazon Stores Ads Monetization Team's vision is to enable customers to discover products they love from brand owners around the world. Amazon Stores are the product showroom for the "everything store", our reach and impact uniquely positions us to innovate on behalf of our customers. The The Amazon Stores Ads Monetization Team's partners with organizations across Amazon to drive high-quality advertising experiences across geographies, intents, missions, products and businesses; while ensuring a cohesive, lovable shopping experience. We are looking for a Principal Applied Scientist to drive the development signals to optimally blend sponsored and organic recommendations on the site. You will work with science and business leaders from Shopping and Advertising to build Machine Learning (ML) models to determine when, where, and how many ads to show depending on customer characteristics and shopping missions. You will partner with product managers, other scientists, and software engineers to implement your ideas at scale. About the team This role is within a brand-new organization focused on delighting customers while driving revenue. Prospective candidates should have the desire and capability to drive results from the 'ground floor' of an impactful and important charter.