E-commerce Site for Digital Products

I'm looking for an experienced developer to create an e-commerce website specifically for selling digital products like e-books, PDFs, and study materials. The site should feature automated downloads for seamless product delivery.

Key Requirements:
- User-friendly interface
- Secure payment gateway integration
- Automated download delivery system
- Mobile-responsive design
- SEO optimization

Ideal skills and experience:
- Proven track record in e-commerce website development
- Strong knowledge of digital product delivery mechanisms
- Expertise in SEO and UI/UX design
- Experience with secure payment integrations

Please provide a portfolio with relevant work.