A Content Management Systems (CMS) developer designs and develops web-based applications using CMS platforms like WordPress or Drupal. They customize the CMS to meet specific needs, implement plugins, and design themes for unique website aesthetics. They handle user permissions, improve site performance, and ensure the website's security. They also troubleshoot issues, update system features, and provide technical support. Their role involves a mix of both front-end (user interfaces) and back-end (servers, databases) development. They work closely with other team members including content creators and graphic designers to create a functional and user-friendly website.