A Mobile Development () developer specializes in designing and creating applications for the Windows Phone platform. They utilize Microsoft's Silverlight and XNA frameworks, and code in C# or VB.NET to create interactive and user-friendly apps. Their responsibilities include understanding client requirements, creating application designs, writing clean and efficient code, testing the app for bugs and improving its performance. They also ensure the app is compatible with different devices and screen sizes. Additionally, they work on updates, troubleshoot issues, and maintain the app post-launch. They need to stay updated with the latest trends in technology.