A framework for bootstrapping and building microservices Cosys come with a set of modules and tools to help you build your microservices in a fast and efficient way.
The core of cosys is built in golang, however multiple languages are supported for the microservices through the use of gRPC and go-plugin by Hashicorp
The project is still in early development, but you can see how Cosys will be implemented in real time in this link