Michael Krenz, Engineering Director at Delivery Hero, dives into cost optimization in the cloud through AWS services. He discusses innovative strategies like using spot instances to lower operational expenses and the shift from SQL to NoSQL databases. Krenz emphasizes the importance of cultural accountability among engineers in achieving a 10% cost reduction per order. The conversation also touches on the integration of machine learning within a customer data platform, showcasing how collaborative efforts can drive profitability and experimentation.