I've been a developer for over 14 years. As a web developer I am constantly wearing many hats going from one project to another. Luckily when working in an Agile environment with good acceptance criteria a backlog task can be grabbed and worked on with screenshots and explanations. I use Bootstrap and custom CSS to create responsive web pages as needed. I'll test on a variety of devices to make sure the site is acting as it needs to for the various media queries.
In my most current role I work with C#, Web APIs, JQuery, Angular I and Drupal 8. As a group we are working on obtaining SuiteCommerce Advanced Developer Certification.