There are many examples of a "hello world" for event-driven architecture, but there doesn't seem to be the equivalent of the "sinatra/express" of event-driven a

There are many examples of a "hello world" for event-driven architecture, but there doesn't seem to be the equivalent of the "sinatra/express" of event-driven architecture, a minimalistic foundation to build a customized platform using the approach. Things like schema migration layer would nicely onto something like this. Most event-driven systems are big company projects with a lot of legacy requirements and integration complexity, or they are narrowly tailored and hard to generalize. I think that a simple template event-driven system that includes a small number of libraries and does something simple but interesting would be a big help. I've been wanting to create an open source event-driven e-commerce system but haven't had the time.