Cross-Platform E-commerce App Development

I'm looking for a skilled app developer to build an E-commerce app for both iOS and Android.

Key Features:
- User Account Management: The app should allow users to create, manage and personalize their accounts.
- Payment Gateway Integration: A secure and efficient payment system is a must.
- Product Search and Filtering: Users should be able to easily search for and filter products.

Ideal Skills:
- Proficiency in cross-platform app development
- Experience in E-commerce app development
- Knowledge of secure payment gateway integration
- Skills in implementing user account systems and product search features.

Please provide examples of similar projects you've worked on.