Shopify E-commerce Site Development

I'm seeking a skilled developer to create a comprehensive e-commerce website on Shopify. The site will need to be user-friendly, visually appealing, and optimized for sales.

Key Requirements:
- Custom Shopify theme development or customization
- Setup of product pages, collections, and navigation
- Integration of payment gateways and shipping options
- Implementation of SEO best practices
- Mobile responsiveness is a must

Ideal Skills and Experience:
- Proven experience with Shopify
- Strong background in e-commerce website development
- Knowledge of SEO and mobile optimization
- Familiarity with payment gateways and Shopify apps

Please provide a portfolio showcasing similar projects.