I need an experienced developer to build "The Skin Story," a digital subscription-based app for my clients. This app tracks clients' skincare progress using images uploaded by our clinic and clients at home, creating a personalized, interactive timeline. **Key Features:** - Interactive photo timeline - Professional (clinic) and home photo uploads - Personalized skincare advice integrated with existing skin scanner tech - Secure in-app messaging with skincare specialists - Educational skincare content - Subscription-based access (monthly/yearly) with payment integration - Integration with CRM, appointment booking, and Phorest salon software - Product tracking: record purchases via Phorest, show history, predict replenishment, and link to webshop **Technical Requirements:** - Cross-platform (iOS, Android, Web) - GDPR-compliant, secure data handling - User-friendly UI/UX Provide examples of similar apps, proposed timeline, and cost.