With more then 5 years of professional experience developing on both backend and frontend you can expect clean coded website that is optimized for speed.
Some of the languages and libraries i have experience with:
Back-end: PHP, MySQL, SQLite, WordPress, Laravel, Drupal, Node
Front-end: CSS3, HTML5, SASS, Foundation, Bootstrap
Mobile: Cordova (PhoneGap), Ionic Framework, Android & iOS SDK, Wikitude, Firebase
Tools: Linux, Apache, Git, SVN, npm, Grunt, Gulp, Bower, Composer, Vagrant