Salon Website & App Suite

I’m looking for an experienced web & mobile app developer to build a high-performance website and iOS/Android app for a hair salon. I already have a one-page website, a premium ThemeForest theme, and an existing site (https://hairbyaggela.co.uk/). I need a full salon website (using the current theme or a new one), iOS & Android apps, an online shop for products and services (WooCommerce), a client booking system, and a modern, clean UI/UX with fast loading as a top priority. Features should include user accounts, appointment booking, push notifications, online payments, an admin panel for managing bookings/services/products, GDPR compliance, SEO-friendly and mobile-first design, and publishing to the App Store and Google Play. Treatwell.co.uk calendar sync or integration is a big plus. Please include relevant past projects, your recommended tech stack, timeline and cost estimate, Treatwell integration experience, and post-launch support options.