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I'm curious how CI is done on branches. It's mentioned but not elaborated on in the article.

Every branch is scheduled to build in Jenkins as soon as it gets pushed. We get success/failure notifications in Campfire.

So is there a separate Jenkins job per feature branch? How are these created?

I'm not sure it's how GitHub does it, but we use the jenkins gem to do pretty much the same thing: https://github.com/cowboyd/jenkins.rb