I can work with any CMSs or Frameworks based on PHP, but I just love to work with WordPress and from designs perspective it is Twitter Bootstrap. WordPress including theme customization and development, plugin customization and development, e-commerce solutions (WooCommerce, WP-Ecommerce, WP-Eshop), most type of payment gateway integration, various API creation and integration, Genesis frameworks, template engines, etc.. I can say that I prefer development using WordPress then others as this is my strong point and I can provide solutions to any requirements given to me with satisfaction guaranteed.