The REWE Group is an internationally active retail and tourism group headquartered in Cologne, founded in 1927 as a cooperative purchasing organization. Today, with numerous supermarkets, discount stores, and other retail brands, the company ranks among Europe’s largest retail enterprises and pursues a clear strategy that combines economic success with social and environmental responsibility. The Analytics department is firmly anchored within the company and supports over 40 departments by establishing advanced analytics and artificial intelligence as key decision-making and value drivers throughout the entire organization. We address all analytical questions along the REWE Group’s value chain. Our vast data treasure trove comes from 8 million receipts per day from 6,500 stores carrying 250,000 different items. Using state-of-the-art technologies, we develop solutions for practical decision support and process 90 terabytes of data per week. From Cologne, for Germany, and for over 12 million customers every day.