A Language and Framework Development developer designs, tests, and maintains programming languages and frameworks. They create tools to simplify coding process, increase programming efficiency, and improve code quality. They define syntax and semantics of new programming languages or refine existing ones. They also build frameworks that provide a standard way to build and deploy applications. They may work on libraries and APIs for specific tasks, like database access, server communication, or UI development. Their work involves coding, debugging, research, documentation, and collaboration with other software developers. They need strong analytical, problem-solving, and programming skills.