E-commerce App Development for Website

I'm seeking an experienced app developer to build an e-commerce app for my website. The app must be compatible with both iOS and Android platforms and support credit/debit card payments.

Key Requirements:
- E-commerce capabilities
- User account management
- Content display
- Compatible with iOS and Android
- Support for credit/debit card payments

Ideal Skills and Experience:
- Proven track record in app development
- Strong recommendations from previous clients
- Experience with e-commerce app functionalities
- Ability to deliver on time and within budget

Please provide examples of previous work and client testimonials.