WordPress Developer Needed (with custom PHP code)

We are using ProfileGrid on our WordPress site to manage agent registrations and display their information. Currently, ProfileGrid only supports simple custom fields, but we want to enhance the registration and directory system with Bangladesh’s full geo-location mapping (Division → District → Upazila → Union).

We already have the complete dataset in multiple formats (SQL, CSV, JSON, PHP Array, XML) sourced from official records (bangladesh.gov.bd, Wikipedia, Google Maps).

The goal is:

During registration, agents should select their location step-by-step:

Division → District → Upazila → Union (cascading dropdowns).

On the frontend directory, users should be able to filter/search agents using the same geo hierarchy.

All selected values should be saved to the user profile (via usermeta or ProfileGrid’s field system).

The solution should not break with ProfileGrid updates (i.e., use hooks/custom plugin instead of editing core files).