Cross-Platform Service E-Commerce App

I need a complete e-commerce mobile application that lets customers browse and purchase services directly from their phones. The app must run smoothly on both iOS and Android from a single code-base, so frameworks such as Flutter or React Native are ideal, though I am open to your recommended stack if it achieves native-level performance and clean UI.

Core flow
• A modern storefront where services can be listed with images, descriptions, pricing, and real-time availability.
• Secure account creation and sign-in, preferably with social logins and two-factor support.
• A simple cart and checkout that handles service bookings rather than physical shipments, with payment gateway integration (Stripe or similar) and instant confirmation.
• Order history and push notifications to keep users informed about upcoming appointments or service status.
• An admin console (web or in-app) so I can add, edit, or remove services, manage bookings, and view sales analytics.

Acceptance criteria
1. One binary each for the App Store and Google Play that passes their review guidelines.
2. Source code, build instructions, and basic unit tests delivered through Git.
3. Clear documentation covering environment setup, feature list, and how to extend the catalog of services.
4. A brief hand-off session so I can walk through deployment, adding new services, and processing refunds.

Please outline the milestones you foresee—design, development, testing, app store submission—and the approximate timeline for each. If you have examples of past cross-platform e-commerce apps, sharing live links or screenshots would help me decide quickly.