An ASP.NET developer can help create dynamic, efficient, and secure web applications for your business. They have the ability to use Microsoft's latest framework which supports cross-platform capabilities, optimizing your application for different operating systems. Their expertise in MVC architecture can enhance the performance of your app through effective separation of concerns. Hiring an ASP.NET developer also ensures that your application is scalable, can handle large volumes of traffic, and is easier to maintain. Their familiarity with .NET Core and other Microsoft technologies can provide a holistic solution to your web development needs.