A Final Cut Express developer is a software developer specialized in creating, modifying and improving the Final Cut Express software, a non-linear video editing program from Apple. They work on coding, debugging, and testing the software to ensure its functionality and efficiency. They also develop new features, improve the user interface, and fix any bugs or issues that users may encounter. Additionally, they collaborate with other team members, like UX designers and QA testers, to enhance the overall user experience. They also provide technical support and help create documentation for users. Their ultimate goal is to improve video editing capabilities for users.