[jonahbenton]

Microservices are about the data, not the code. Sharing code is really not an issue. Defining data domain boundaries and data change protocols is the challenging issue in application level architecture. See no mention of data here, so...moving on.

[david-j-vujic]

Even though you have clear boundaries between microservices, the source code is likely possible to be reused by other services. You probably have common setup (like config loaders, logging and auth) and, depending on the use case, probably also parsers and data reading features that would be duplicated or put in an external libraries.

Yes, Microservices is about boundaries, data and the organizational structure. But there is code that makes these things happen and much of that can be reused.