Cozy 3 (Coming in 2017)
We use Go and CouchDB as our main technologies.
Go (often referred as golang) is an open source programming language created at Google in 2007.
CouchDB is surely less-known, but definitely reliable. As a proper Erlang program, it has proven its strength and stability. A consistent, well-documented API, plus wonderful replication capabilities: the recipe of what we love of a database engine.
For now, most of the documentation of the new stack is available in the repository of the new stack.