We recently had a HTML5 website (built on the Bootstrap frontend framework) converted to a custom Wordpress theme and found that there were many shortcuts taken that disabled some of the native, core functionality of Wordpress. E.g. Widgets is not an available option from the Appearance menu and the visual composer is not available for most Page Types. We do not know how far the code hack of Wordpress goes and if this is surely reversible, which makes this project 2 phases.
Phase 1: detailed analysis of what core functionalities have been changed and how it can be fixed
Phase 2: reverting the hack to restore native Wordpress functionality for those specific functions
We would plan to create milestones for each phase in case Phase 1 deems the hack irreversible.
The freelancer applicant should have extensive knowledge of the core code construct of Wordpress.