Shopify Ecommerce Site Development

I'm seeking an experienced Shopify developer to create an ecommerce website for selling perfumes and related products. I currently have a website on Quicksell and need guidance on migrating and building on Shopify.

Key Requirements:
- Platform Transition: Advise on best practices for moving from Quicksell to Shopify.
- Site Development: Build a user-friendly and aesthetically pleasing Shopify site.
- Payment Gateway Integration: Set up an easy-to-use payment gateway (e.g., PayPal, Stripe, or Square).

Ideal Skills and Experience:
- Proficiency in Shopify development
- Experience with ecommerce site migration
- Strong knowledge of payment gateway integration
- Good design sense for an attractive user interface

Please provide a portfolio with similar projects.