For several years eBay relied on a vendor platform for analytics functions until recently when it shifted to an in-house platform. This two-part series explores why eBay decided to move out of a critical platform and how this complex shift was achieved. — By: Ishita Majumdar, Medha Samant, Naveen Dhanpal How did it begin? eBay’s journey with a commercial data warehousing platform began in 2003 and ended in 2021. During these years, the platform had steadily grown in size amassing over 20 Petabytes of data including behavioral and transactional data that includes bids, checkouts, listings, users, and…