A -x developer designs and develops games and applications using the -x framework, a cross-platform suite for building games, apps, and interactive media. They write code primarily in C++, but also in JavaScript and Lua. They utilize the framework's features like sprites, animations, particle systems, and physics engines to create engaging gaming experiences. Their work involves optimizing graphics and performance for different platforms (iOS, Android, Windows, etc.), debugging code, and often collaborating with artists, designers, and other developers. They also ensure games are responsive and adapt to different screen sizes and resolutions.