A Magento developer works on eCommerce websites using the Magento platform. They are responsible for designing and implementing the website's layout, functionalities, and performance. Their tasks include customizing extensions, integrating Magento with other systems like ERP or CRM, and creating custom modules. They also ensure the website is SEO-friendly and secure. They work closely with clients, understanding their needs and translating them into technical specifications. Developers are often involved in the entire development process, from planning to testing, and they also provide post-launch support. They need to stay updated with the latest Magento versions and eCommerce trends.