An Avid Media Composer developer designs, develops, and maintains software for Avid Media Composer, a professional video editing program. They write code, fix bugs, and improve the functionality and performance of the software. They also collaborate with other developers, UX designers, and product managers to enhance the user interface and add new features. They test the software for quality assurance, debug issues, and ensure it works seamlessly on different platforms. Additionally, they may create documentation for other developers and users, and stay updated on the latest programming techniques and video editing trends.