Explore the complexities of e-commerce system design in this 58-minute conference talk from NDC Conferences. Delve into the challenges of implementing a seemingly straightforward shopping cart feature, and discover how evolving requirements can lead to problematic technical shortcuts. Analyze the impact of complex use-cases on overall design, and learn how to focus on business needs to guide the correct approach. Gain insights into decomposing requirements, building the right software, and implementing effective solutions such as view model composition and vertical slices. Walk away with a new understanding of how to tackle complex e-commerce systems and avoid common pitfalls in aggregate design.