Startup Website and App Development

I'm looking for a skilled web and app developer to build a platform for my startup.

Requirements:
- E-commerce functionality
- Online services integration
- Payment methods: Credit/Debit Card, PayPal
- Both iOS and Android app development
- Continuous backup after implementation

Ideal Skills and Experience:
- Experience in e-commerce website development
- Proficiency in integrating multiple payment gateways
- Mobile app development for both iOS and Android
- Strong background in providing ongoing maintenance and backup services

Please provide your bids along with relevant experience.