(kubernetes co-founder here)

Kubernetes Developer docs: https://github.com/kubernetes/kubernetes/tree/master/docs/de...

Kubernetes Developer proposals: https://github.com/kubernetes/kubernetes/tree/master/docs/pr...

They're by no means perfect, but we try to be super open about our development process.

Many of the github issues also have comprehensive discussions of topics, searching the repo for topics you're interested in will often surface interesting discussions.

If you want to get more deeply involved, I'd suggest the Kubernetes community meeting (Thurs, 10am Pacific)