We spent years rearranging the same architectural boxes. Three-Tier Architecture evolved into Clean Architecture, which then evolved into Vertical Slice Architecture. Each shift solved the problems created by the previous one, steadily moving us toward smaller, more focused deployment units.

WebAssembly may be the point where that journey converges into truly portable serverless applications.

For the first time, serverless workloads can be packaged as lightweight, portable artifacts while maintaining Kubernetes-native operations.

In this session, we will build and deploy a portable WebAssembly function that runs on Kubernetes with sub-millisecond startup times, event-driven scaling down to zero, distributed state, and full observability on the Azure Kubernetes Service. Unlike traditional cloud functions, these components are not tied to a vendor runtime, proprietary hosting model, or platform-specific API surface. They are portable application artifacts that can run on any Kubernetes cluster.

We will briefly discuss the evolution from layered architectures to vertical slice architecture, focusing on how application boundaries became smaller, more autonomous, and increasingly deployment-oriented. The rest of the session is hands-on.

By the end, you will have a working repository that you can immediately clone, as well as a practical understanding of where WebAssembly-based serverless fits in real systems and when managed platforms, such as Azure Functions, are the better engineering choice.