Shopify developer and designer - Css and coding is obligatory

For several things I am building Shopify websites. For those websites we need unique designs. We are searching for a developer who is well experienced with coding, css and also making the design framework. First we will tell you the requirements, than you need to start designing and after the design is approved you have to build it. We need many websites so it is for longer term. You need to be able to custom code in Shopify, that's a must.