Application architectures

For an event-driven application, there are a few application architectures that we can choose between. They have their pros and cons, and for green field projects, there is only one recommendation I’d make.

Monolithic architecture

This is an application that is typically built from a single code base and is deployed as a single resource. These kinds of applications have the advantage of being easy to deploy and are relatively simple to manage and operate. Outside of needing to maybe communicate with some third-party APIs, a single user interface and database will be most of the infrastructure concerns. The application shown in Figure 2.14 is easy to scale to handle more users by simply deploying it to more instances that point to the same database:

Figure 2.14 – A monolith application

On the other hand, the larger a monolith grows, the harder it is for teams to develop it efficiently, as the development of new features...