E-commerce App Development

I'm looking to build a mobile e-commerce app for both iOS and Android platforms.

Key Requirements:
- User-friendly interface
- Secure payment integration
- Advanced search and filter options
- User account management
- Order tracking system
- Push notifications for deals and updates

Ideal Skills and Experience:
- Proven experience in developing mobile apps, especially e-commerce
- Strong knowledge of payment gateway integration
- Expertise in UI/UX design
- Familiarity with both iOS and Android development environments
- Good communication skills for regular updates

Please provide a portfolio of similar projects.