A CLR (Common Language Runtime) developer is responsible for designing, implementing, and managing software applications using Microsoft's .NET framework. They work with languages like C# and Visual Basic, utilizing the CLR environment for executing .NET programs. They handle memory management, security, and exception handling. Their tasks include writing clean, scalable code, debugging, and ensuring software compatibility across platforms. They collaborate with other team members to identify and fix software issues, often using CLR's diagnostic tools. Additionally, they may be tasked with updating or improving existing software and creating technical documentation.