Shopify Expert

I am looking for a Shopify expert to help with the following tasks on my Shopify store:
- Design and theme customization
- Product listing and optimization
- Payment gateway setup

I have a clear idea of the design and theme that I want for my store.

Additionally, I want my Shopify store to be mobile responsive.

Ideal skills and experience for this project:
- Proficiency in Shopify and its customization options
- Strong design skills and experience in theme customization
- Knowledge of product listing and optimization techniques
- Expertise in setting up payment gateways
- Familiarity with mobile responsiveness and best practices