E-commerce Website Design

I'm looking for a skilled web designer to create an e-commerce website for my business. The site should be user-friendly, visually appealing, and optimized for sales.

Key Requirements:
- Design is crucial; I need a site that stands out.
- Must be mobile-responsive.
- Integrated payment gateway is a must.
- SEO optimization to improve visibility.

Ideal Skills and Experience:
- Proven experience in designing e-commerce websites.
- Strong portfolio showcasing previous work.
- Knowledge of SEO and site optimization.
- Proficiency in at least one major e-commerce platform (Shopify, WooCommerce, or Magento).

Please provide your portfolio and estimated timeline.