A Flash Media Server developer specializes in creating, managing, and optimizing applications for Adobe's Flash Media Server. They design interactive multimedia applications, like live streaming and on-demand video services, video chats, and multiplayer online games. They also ensure smooth data communication between the server and Flash client, handle server-side scripting, and manage real-time data synchronization. Their responsibilities include enhancing user experiences, maintaining the server's stability, and troubleshooting any issues. Their work is crucial for efficient media delivery over the internet, ensuring seamless, high-quality media streaming for users.