Shopify Development: Major & minor changes, page building, theme building

I am a founder of a digital marketing agency and I am looking for a freelancer for Shopify development. I am looking for someone who is very well-versed with the Shopify website and interface and is also has enough knowledge of CSS, HTML, and other relevant coding skills required for the development of Shopify e-commerce websites. I need someone to get on board ASAP!