A Gtk developer is a software engineer who specializes in developing, debugging, and enhancing applications using the GIMP Toolkit (Gtk). This toolkit is a multi-platform library for creating graphical user interfaces (GUIs), often used for applications on Linux. The developer uses programming languages like C, C++, or Python to create user-friendly and responsive applications. They are responsible for designing the user interface, writing code, testing the software for bugs, and making necessary updates. They also collaborate with other team members to integrate Gtk applications with other software components, ensuring a seamless user experience.