Senior Full Stack WordPress Developer for Custom Membership Platform

We are building The Coping Box, a modern subscription-based clinical resource platform for therapists, educators, and families. This is not a typical business website—we are building a scalable web application with a searchable resource library, user accounts, subscriptions, custom content management, and future interactive features. We are looking for an experienced Full Stack WordPress developer with strong PHP experience who has built custom WordPress applications, plugins, memberships, and API integrations. Version 1 includes: Custom resource library Search & filtering User accounts Subscription payments Resource detail pages Admin dashboard Mobile responsive design Please include examples of similar WordPress applications or membership platforms you've built.