WordPress E-commerce Site Development

I'm looking to develop a single-page e-commerce website on WordPress. The site will primarily feature physical products.

Essential requirements:
- User-friendly and responsive design
- Secure payment gateway integration
- Product categorization and search functionality
- Basic SEO optimization

Ideal Skills & Experience:
- Proficiency in WordPress and e-commerce setup
- Experience with payment gateway integrations
- Knowledge of SEO best practices
- Strong design skills for a modern, clean look

Please provide examples of previous e-commerce sites you've developed.