E-commerce Website Development -- 2

I'm looking for an experienced website developer to create an e-commerce site for me. The website will primarily sell physical goods and must include a shopping cart feature.

Requirements:
- User-friendly shopping cart
- Secure payment gateway integration
- Mobile-responsive design
- SEO optimization

Ideal Skills and Experience:
- Proven track record in developing e-commerce websites
- Strong knowledge of payment gateways and security
- Proficient in SEO and web analytics
- Excellent design skills with a portfolio to showcase

Please provide examples of previous work and a detailed proposal.