Great product! I was part of a team that wanted to rapidly test different marketing approaches using data in Salesforce etc. My colleagues were mostly non-technical so I had them try out Zapier and they loved it! I can see how Paragon can be useful to them.

Quick question - are you using some kind of UI library to power the graphical builder? I recall coming across a JS library in the past that looked very similar but I can't remember what it was called.