Shopify E-commerce Website Development

I'm looking for an experienced developer to create a Shopify e-commerce website.

Requirements:
- Design an attractive, user-friendly interface.
- Set up product listings, categories, and navigation.
- Integrate secure payment gateways.
- Implement SEO best practices for visibility.
- Ensure mobile responsiveness and fast loading times.
- Provide training on managing the site post-launch.

Ideal Skills:
- Proven experience with Shopify.
- Strong background in e-commerce website development.
- Knowledge of SEO and mobile optimization.
- Excellent design skills.

Please provide a portfolio with relevant work.