A lighthouse project, a cost-cutting tool, a beacon of hope and an important building block in the fight against pandemics - the German Corona Warning App System (CWA for short) consists not only of the quite prominent native iOS and Android apps that you may also have installed on your smartphone. The implementation of important use cases such as personal risk assessment, reporting or notification of (positive) test results, or exchange with warning systems in other countries also includes a multi-part server solution. It is based on a contemporary architectural style and an up-to-date technology stack. And was realized under high time pressure in a lead role by SAP and Deutsche Telekom.

Public interest in this project is high, as is the transparency of the development process. The source code is open source and the documentation is also openly accessible. In this talk you will get to know the overall solution, especially the server-side part of the Corona warning app and its implementation. We will discuss the formative architectural requirements and the choices made. Finally, we will evaluate the chosen solution approaches and work out strengths, drawbacks and trade-offs.