E-commerce Website Development

I'm seeking an experienced web developer to create an e-commerce website for selling physical products. The site needs to include a shopping cart and checkout feature.

Key Requirements:
- User-friendly interface
- Secure payment processing
- Mobile-responsive design

Ideal Skills and Experience:
- Proven track record in developing e-commerce sites
- Expertise in shopping cart and checkout functionalities
- Strong understanding of UI/UX design principles

Please provide samples of previous work and a brief outline of your approach.