An Apple Final Cut Pro X developer designs, develops, and maintains software for Final Cut Pro X, Apple's professional video editing application. They work on enhancing its functionality, resolving bugs, and improving user interface. They must understand video editing workflows, and have expertise in programming languages like Objective-C, Swift, and AppleScript. They collaborate with UX designers to optimize user experience and with quality assurance teams to troubleshoot issues. They also integrate third-party plugins and ensure the software is updated with the latest video formats and technologies. They may also create and maintain documentation for the software.