E-commerce Website Development for Digital Products

I'm looking for a full end-to-end development of an e-commerce website similar to cellphoneman.ca, but focused on selling digital products.

Key Requirements:
- Development of a user-friendly, intuitive interface
- Implementation of a secure, reliable payment processing system that accepts Credit/Debit cards, PayPal,
- Integration of a robust, scalable back-end to handle digital product delivery
- SEO-optimized design to improve online visibility

Ideal Skills:
- Proficiency in web development languages (HTML, CSS, JavaScript, etc.)
- Experience in e-commerce website development
- Knowledge in secure payment gateway integration
- Familiarity with SEO principles
- Understanding of digital product delivery systems