Don't put a lot of code in the application directory. If you think the code can be imported and used in other projects, then it should live in the /pkg directory. If the code is not reusable or if you don't want others to reuse it, put that code in the /internal directory. You'll be surprised what others will do, so be explicit about your intentions!

We manage our applications via cobra (cobra-cli is installed within the Dockerfile within the development stage, /cmd consumes the core cobra library), see:

Also see https://github.com/golang-standards/project-layout/tree/master/cmd