A .NET . developer designs, implements, and manages software applications using Microsoft's .NET framework .. They utilize languages such as C# or VB.NET, and tools like Visual Studio. They engage in the entire software development lifecycle from understanding requirements, designing application structures, coding, debugging, testing, to deploying and maintaining the system. They also work with databases, APIs, and web services, ensuring optimal performance, security, and user experience. Their tasks often involve problem-solving, debugging, and enhancing existing software. They may also collaborate with other team members, like UI/UX designers, project managers, and testers.