An Application Developer designs, creates, and maintains software applications to enhance organizational efficiency and user experience. Key responsibilities include coding, testing, debugging, and collaborating with cross-functional teams such as project managers and UI/UX designers. Required skills include programming languages (Java, Python), software development methodologies, and problem-solving abilities. Typically, developers work in an office or remote environment, and can advance to senior roles, project management, or specialize in areas like mobile app development or cloud computing.