Expert Shopify Developer for Portfolio Site

I'm in need of a seasoned web developer with a strong background in creating and optimizing Shopify sites. The project involves setting up a portfolio showcase with custom design themes and integrating advanced payment gateways.

Key Requirements:
- Proven experience with Shopify development
- Ability to create custom design themes
- Expertise in integrating advanced payment gateways
- Familiarity with UX/UI design principles
- Understanding of SEO best practices

The ideal candidate will not only build the site but ensure it is secure, optimized for performance, and provides a seamless user experience. A portfolio showcasing previous Shopify projects, especially those with custom design themes, will be highly beneficial.