A .NET . - .NET . developer is skilled in a mature and versatile technology that supports a wide range of applications. They can develop robust and scalable web, desktop, and mobile applications with high performance. Their knowledge includes strong security features, efficient memory management, and a rich class library. Furthermore, their experience with older versions denotes a strong understanding of the framework's evolution, enabling them to maintain or upgrade legacy systems effectively. This experience also provides a solid foundation for learning newer .NET versions, ensuring their skills remain relevant.