A MailEnable developer works on the MailEnable platform, a Windows-based, enterprise-grade email server application. They are responsible for creating and maintaining the software's features, including email services, webmail, calendar, and contact management. They handle the integration of MailEnable with other systems and ensure its stability and security. Additionally, they troubleshoot and resolve any issues or bugs within the system. They also work on improving the system's performance and user interface, and they may collaborate with other developers or IT professionals to meet the specific needs of an organization or client.