E-commerce App and Website Development

I'm looking for a skilled team to develop an e-commerce application and website from scratch. The app should be available on both Android and iOS platforms simultaneously.

Key Requirements:
- User-friendly interface and seamless navigation
- Secure payment gateway integration
- Robust backend to handle inventory and user data
- Mobile-responsive website design
- Comprehensive search and filter options
- User account creation and order tracking
- Review and rating system for products

Ideal Skills and Experience:
- Proven experience in developing e-commerce applications and websites.
- Strong knowledge of backend and frontend technologies.
- Expertise in UI/UX design.
- Familiarity with secure payment systems.
- Ability to work within budget and meet deadlines.

Please provide a portfolio showcasing similar projects.