Shopify E-commerce Site Development

I'm seeking an experienced Shopify developer to create a robust e-commerce website for selling digital products.

Key Requirements:
- Design an intuitive, user-friendly interface
- Set up a secure payment gateway
- Implement SEO best practices
- Ensure mobile responsiveness
- Integrate necessary apps and plugins for enhanced functionality

Ideal Skills and Experience:
- Proven Shopify development experience
- Strong understanding of e-commerce and digital products
- Familiarity with SEO and mobile optimization
- Graphic design skills are a plus

Please provide a portfolio of previous work.