A Joomla CMS developer is responsible for designing and implementing websites using Joomla, a popular content management system. They create custom templates, modules, and plugins to enhance website functionality, ensure website responsiveness across devices, and improve user experience. They also handle the integration of third-party applications, troubleshoot and resolve issues, and perform regular updates and maintenance tasks. Additionally, they work on SEO optimization, data migration, and security aspects. Their role requires strong knowledge of PHP, HTML, CSS, JavaScript, and SQL, along with a solid understanding of Joomla's structure and development practices. They often collaborate with other team members to deliver high-quality web solutions.