Served as a core contributor and founding engineer for Amazon Advertising's Private Marketplace (PMP), a programmatic platform facilitating automated real-time bidding and deal execution between ad suppliers and Amazon's Demand-Side Platform (DSP). Architected and implemented globally distributed, multi-region NoSQL indexes leveraging Amazon's proprietary distributed data store to support internationalized product catalogs and ad inventory for Amazon's advertising offerings. Collaborated closely with cross-functional teams to design and implement large-scale system changes, enabling guaranteed impression delivery for programmatic deals within Amazon's DSP. Developed and optimized high-throughput, low-latency services handling real-time bid requests and ad serving, contributing to a revenue generation of $6 million within the first quarter of launch. Utilized agile methodologies, test-driven development, and continuous integration/continuous deployment practices to ensure rapid iteration and reliable software delivery.