Shopify Website E-Commerce

I am looking for a Shopify website designer who can create a modern and sleek theme for my e-commerce store. I would like to have a payment gateway integrated into the website to make the checkout process smooth for my customers. My target audience is middle-aged adults, so the website should be user-friendly and easy to navigate.

Ideal skills and experience for the job:
- Experience in designing Shopify websites with a modern and sleek theme
- Proficiency in integrating payment gateways into e-commerce websites
- Understanding of user experience design principles for middle-aged adults
- Knowledge of Shopify apps and plugins for email marketing and custom product filters (optional)