I think that the main point of OP is that it's possible to serve production load using just one server. I did not looked into source code yet but I suppose tha

I think that the main point of OP is that it's possible to serve production load using just one server. I did not looked into source code yet but I suppose that OP if not implemented already than there should ideas for implementation. In addition: from my POV implementation of scaling for such service should be trivial: - sharding of data between instances by a criteria (e.g. regional) or by hash - configure network routing I think it should work