An ASP.NET Developer is a software professional specializing in building dynamic web applications, services, and APIs using ASP.NET, a framework developed by Microsoft. They are proficient in programming languages like C# and VB.NET and work with tools such as Visual Studio and SQL Server to create scalable, secure, and high-performance web solutions. ASP.NET developers focus on backend development, database integration, and implementing robust functionalities while ensuring responsive design and cross-platform compatibility. Their expertise is essential for developing enterprise-level web applications, e-commerce platforms, and content management systems.