I think I did not present this correctly, I apologize for that. What I mean this this. Any IDL interfaces live at their functional boundaries. e.g all proto de

I think I did not present this correctly, I apologize for that. What I mean this this. Any IDL interfaces live at their functional boundaries. e.g all proto definitions shared internally by java services live under jumanji/proto/, all proto definitions shared internally bu Go service live under goat/proto/ and so on so forth. But anything which is shared in a public manner e.g any proto definitions between Java and C live outside either of these repos in top level common_proto/ repo. The build system is configured to take care of pulling the correct proto version from common_proto repo. We use maven for this, but nothing much we can do about that. Build systems are ugly and we have to live with maven in near future. EDIT: Oh that said, stop using required field in protobufs if you are stuck using proto2 like us, whoever decided to add required field to proto2 grammar made a mess. Things change and deprecate repeatedly, gazillions of required fields are annoying and recipe for disaster.