From the directory tree one can see that the code is organized into separate namespaces. In the example implementation this is achieved by splitting the code into different folders, since this is a one-to-one mapping to packages (namespaces) in the Go programming language.

The api folder contains the API, the host web servers or GUI apps, the service contains the boundary layer with the request and responses models, the core layer contains the core program architecture hidden from view.

As mentioned previously, the purpose of the program should be visible by looking at it. By exploring the service directory (containing gophers.go et al.) we can immediately see the services this program provides.