Building an End-to-End Amazon Movers & Shakers Data Pipeline: Engineering Guide from Real-Time Crawling to Automated Ale

Background I've been building data infrastructure for Amazon seller tools for the past three years. The most consistently requested feature from our seller clients is early trend detection — specifically, getting notified when a product starts showing unusual rank velocity before the broader market notices. Amazon's Movers and Shakers (MnS) list is the best public data source for this. It tracks the largest BSR gainers in each category over a rolling 24-hour window, updating hourly. A product cl