Do you have experience working with the Qt library?

Yes, I have experience working with the Qt library. Qt is a powerful framework for developing cross-platform graphical interfaces in C++ (as well as with bindings for other languages).

I have used Qt to create desktop applications with graphical interfaces, including working with widgets, signals, and slots for event handling, as well as working with files and network requests.

Example of a simple window in Qt (C++):

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QPushButton button("Click me");
    button.resize(200, 60);
    button.show();
    return app.exec();
}