I need a full-stack developer who can turn a set of business requirements into a production-ready software package that hooks seamlessly into my existing WordPress environment while also talking to several external APIs and a couple of home-grown internal systems. Here is the scope in plain language: • Integration points – WordPress CMS will serve as the primary entry point for administrators and end-users. – External APIs (REST/JSON) will supply and receive data on product inventory, payments, and analytics. – Two small internal systems (written in PHP) must exchange data with the new code through secure endpoints. • Core features – Robust user authentication with role-based permissions so that staff, partners, and customers each see the right screens and actions. – A data processing engine that ingests raw feeds, applies business rules, and produces on-demand reports viewable inside the WP admin as well as downloadable in CSV/PDF. – Full e-commerce flow: catalog display, cart, checkout, and payment gateway hand-off, all styled to match the current site. • Tech expectations – Clean, object-oriented PHP that respects WordPress coding standards. – Modern JavaScript (ES6+); vanilla or a lightweight framework if it keeps load times low. – Clear separation of concerns so that future updates to the CMS or any API do not break the whole stack. Acceptance criteria 1. Code installs as a self-contained plugin or module without touching core WP files. 2. All three integration channels respond correctly in staging and production. 3. Role tests confirm that users only access what their profile allows. 4. Reports generate under five seconds for a 10k-record dataset. 5. A short deployment guide and inline docblocks accompany the final hand-off. If you have solid experience blending WordPress, PHP, and JavaScript into custom architectures, I’d like to hear how you would approach this build and what timeline you foresee.