Cross-platform E-commerce App Development

I am in need of a skilled mobile app developer who can create a cross-platform e-commerce app for me. The app is intended to sell both physical and digital goods, with a focus on user-friendly interface and secure payment gateways.

Key requirements:
- Development for both iOS and Android
- E-commerce focus
- Supporting both physical and digital goods

Ideal skills and experience:
- Proficiency in app development for both iOS and Android
- Experience with e-commerce app development
- Knowledge of payment gateway integration
- Understanding and implementation of secure app practices

Please share your relevant experience and portfolio. Thank you.