A Microsoft Certified Application Developer (MCAD) specializes in using Microsoft technologies to develop and maintain business applications. They are proficient in .NET Framework, Visual Studio, ASP.NET, and other Microsoft tools. Their tasks include designing, testing, and debugging software, creating user interfaces and databases, and integrating applications with other systems. They ensure software meets business requirements and quality standards. Additionally, they often collaborate with other IT professionals, like system analysts and project managers, to deliver complete solutions. Continuous learning to stay updated with Microsoft's evolving technologies is a crucial part of their role.