1. Is there any best practices doing so? (any resources will be appreciated) 2. Can an old feature (written in ng) contain react-redux parts or I'll have to rewrite it? 3. How can I avoid doing the same API calls? (if both need the same resource) 4. Should I avoid the change all together?

(*) Posted on stack overflow as well: http://stackoverflow.com/questions/37555762/integrating-react-redux-into-an-existing-angularjs-application