Our mission on the Advertising Product & Technology team is to build a next generation advertising platform that aligns with our unique value proposition for audio and video. We work to scale the user experience for hundreds of millions of fans and hundreds of thousands of advertisers. This scale brings unique challenges as well as tremendous opportunities for our artists and creators. We are seeking a Senior Backend Engineer to join the Ad Serving squad. This squad is responsible for ranking ads, conducting the auction, enforcing floor prices, applying blacklist filters, and honoring competitive separation. We build and maintain services that process millions of ad decisions per second. We sit at a critical intersection between advertiser delivery goals, business logic, platform revenue, and ad experience quality. We are looking for someone who is motivated by user and business problems as much as they are by technical problems. Someone who thrives under ambiguity, experimentation, and iteration. You will work directly on the real-time systems that evaluate, score, and select ads across Spotify's global inventory. You will collaborate with our cross-functional teams to ideate, develop, and own complex technical solutions on our ad ranking and auction platforms. As someone who shares our passion for building reliable, high-scale ad infrastructure, you'll have a direct impact on how advertisers reach audiences on Spotify.