The recent announcement of Spring Monolith (Introducing Spring Modulith) fits well into the rising interest in monolithic architectures (Monolithic Architecture Trend). It seems like not everything has to become its own microservice.

Interfaces are great. You can write a library, bind your code internally to interfaces and handout the library to consumers which in turn just implement the interfaces. You, as a library implementer, are none the wiser about any implementers. All you know is your code and your interface. Neat!