Shopify E-commerce Store Development

I need an experienced Shopify developer to create an e-commerce store for me. We will be selling physical goods, specifically in the clothing and accessories category.

Requirements:
- Set up a Shopify store
- Design a user-friendly and visually appealing interface
- Implement secure payment gateways
- Organize product categories and listings
- Optimize for mobile and SEO
- Provide training on managing the store post-launch

Ideal Skills and Experience:
- Proven experience with Shopify
- Strong design skills
- Knowledge of SEO and mobile optimization
- Experience with e-commerce payment systems

Please provide examples of previous work and any relevant certifications.