Some skills/software/frameworks I also use: Agile Method, AJAX, Bootstrap, Codeception, ElasticSearch, Google Analytics, Google Experiments, GruntJS, Git, Github, Mongo DB, MySQL, Node.js, PhantomJS, Shell Scripting.
While I've built and maintained countless Wordpress sites, I try to match the platform to the client. I've built Drupal, Jekyll and most recently Anchor CMS sites.
Almost every site created has involved responsive design from the start. The result is that your site looks and functions well on every browser and device.
Design is about solving problems for the user. I use Photoshop and Illustrator (also Affinity Designer) to create ads, designs, optimized photography and web assets.