The app is ok, it lacks basic customization functionality and the career page is not good looking. I wanted to embed the list of careers in an HTML snippet onto my page builder, but support never answered my emails. This is why I'm leaving the 3 stars.
I have just added in the ability for 3rd Party integration with PageFly as you requested and if you decide to reinstall the app I will gladly support you. The unusually slow to response was on account of the Christmas Holidays, so for that I am sorry. If you change your mind I'll be here to help and either way I hope you have a successful 2021.