A COBOL Developer specializes in maintaining and developing legacy business applications using COBOL programming language. Their role is crucial for organizations relying on mainframe systems, ensuring operational efficiency and system reliability. Key responsibilities include code writing, debugging, and optimization. Required skills include proficiency in COBOL, problem-solving, and analytical thinking. Typically working in IT departments, they collaborate with business analysts and system architects. Career progression may lead to roles such as Senior Developer or IT Manager, with opportunities in modernization projects and transitioning to newer platforms.