I like to follow a pattern I call monomicro. Basically I develop separate programs for different functionality, but make them embeddable so they can be composed

I like to follow a pattern I call monomicro. Basically I develop separate programs for different functionality, but make them embeddable so they can be composed and run in the same memory space for small deployments. The code that runs https://lastlogin.net https://lastlogin.net is a good example. For LastLogin it runs as a globally distributed cluster on fly.io, but it's also fully embeddable in any Golang program to act as an auth layer.