I've 4 years experience in php & wordpress and worked on setting up different premium theme from themeforest and some other market themes with demo content. I will do WordPress theme customization by creating a child theme and will maintain the responsive design for my customized changes. Some of the themes I've worked are following. Divi & Extra from elegant themes. Betheme. X theme. Flatsome. Storefront. P2 theme. Classified themes. Custom bulit theme. Child theme customization.