If you want to have a set of globally defined types and/or language-independent types to share between your various programs or services, gRPC and Protobufs are

If you want to have a set of globally defined types and/or language-independent types to share between your various programs or services, gRPC and Protobufs are a good option. Also, anywhere that you might use RPC you could use gRPC. It has a compact wire format and is pretty user-friendly as far as designing your RPC req/rep types.