Cross-Platform E-commerce App Development

I'm looking for an experienced developer to create a cross-platform e-commerce mobile app for both iOS and Android. The app should include:

- User Accounts: Allow users to create and manage profiles.
- Payment Integration: Secure payment gateway for transactions.
- Product Reviews: Enable users to leave feedback on products.
- Login via Phone Number Verification: Users should log in using phone number verification.

Ideal Skills and Experience:
- Expertise in mobile app development for both iOS and Android.
- Experience with secure payment integration.
- Knowledge of user authentication systems, especially phone number verification.
- Strong UI/UX design skills to ensure a user-friendly experience.

Please provide examples of similar work done and your approach to this project.