I need an end-to-end platform—a responsive website plus companion mobile app—that puts everything a pet owner could want at their fingertips. The core features are settled: real-time vet appointment booking, automated alerts for health reminders or order updates, and a full e-commerce section where owners can purchase food, toys, or any other pet product. I’m happy to expand with additional online pet services if you have ideas that add genuine value. Three user roles must be baked in from the start. Pet owners need an intuitive experience for scheduling, shopping, and tracking their pets’ records. Vets require a dashboard to confirm appointments, view medical histories, and update notes. Product sellers should be able to list items, manage inventory, and handle orders—all while sharing a single, secure sign-on system. The mobile app has to launch simultaneously on both iOS and Android. A unified codebase—Flutter, React Native, or something comparable—works for me as long as every feature remains in sync across web and mobile. Deliverables • Responsive website matching the app’s feature set • iOS and Android apps built from a single codebase • Role-based admin panel for owners, vets, and sellers • Well-documented source code and basic deployment guide I’ll provide branding assets and detailed user flows once we kick off. When you respond, include your proposed tech stack, any similar marketplace or pet-care projects you’ve delivered, and a realistic timeline for MVP through final release.