Hello,
Yes, I can fix the broken page builder as editor in the backend is broken. With the WordPress, I have completed a lot of projects where I have done theme customizations and theme developments from Scratch, Extension Development and lot of customization done with WordPress Platform.
I have more than 7+ year of experience with numerous technologies like word press, Magento, Cake php and Laravel, shopify and have developed numerous successful sites.
I have experienced with Swift framework, atelier template.
Kindly initiate the chat. So I can better assist you.
Regards
Mithu