On paper, any application can appear to be successful. But what happens when suddenly ten times as many users show up as planned, or an entire region goes down? This is precisely where it is no longer the architecture of the application that matters, but the architecture of the system. This presentation focuses on the system architecture of Azure applications, i.e., the layer between software and platform architecture. We look at how different services can be combined in a meaningful way to create solutions that are resilient, scalable, secure, and cost-effective. The focus is on architectural principles and proven patterns rather than a mere list of features. These include high availability through geo-redundant design, elastic scaling during peak loads, security by design with integrated identity and governance, and cost control through conscious architectural decisions. The target audience is solution architects, senior engineers, and technical decision-makers who not only want to operate systems, but also want to consciously design them. Finally, a live demo shows how these principles work in practice. We deliberately break a system and observe how good architecture keeps it alive.