A Microsoft .NET Framework developer designs, implements, and manages software applications using Microsoft's .NET framework. They write clean, scalable codes using .NET programming languages, like C# and VB.NET. They test and debug these applications, ensuring they function well. They also collaborate with internal teams to produce software design and architecture. Their role involves understanding the requirements, creating modules, coding, testing, debugging, documenting the processes, and deploying the software. They also often engage in problem-solving and troubleshooting to maintain and upgrade existing systems, ensuring optimal performance and usability.