Looking to build a progressive web app w/ Infusionsoft as the back end

We are interested in building a progressive web app using a framework like Angular/Butter CMS. Are there any software vendors out there that are similar in usage to what we are using now (Memberium)? Or would this be a purely custom undertaking.

Thanks in advance for responses!

Macanta started out as a front end to Infusionsoft as a back end. It’s become popular enough now that they stand on their own as a product and just integrate with IBK but basically the same idea.