Shopify E-commerce Site Development

I'm seeking an experienced Shopify developer to design an e-commerce website for selling physical products.

Key Requirements:
- Build a user-friendly, visually appealing Shopify store
- Organize product categories for easy navigation
- Integrate secure payment gateways
- Ensure mobile responsiveness
- Optimize for SEO

Ideal Skills and Experience:
- Proven Shopify development experience
- Strong design skills
- Knowledge of SEO best practices
- Familiarity with e-commerce payment systems

Please provide a portfolio of previous Shopify projects.