"Dragon!",
As a highly experienced Python developer, specializing in GUI development, I strongly believe I'm the best candidate for your project. My company, VISIT, has a diverse portfolio of projects including web design, ERPs, CRMs, and e-commerce solutions where I have consistently demonstrated my proficiency in creating user-friendly interfaces.
The key to any successful GUI is understanding the needs of the end-user, which is a skill we at VISIT excel in. We prioritize functionality and user experience in all our developments, which will undoubtedly translate well to your project.
Regarding specific libraries, I have proven expertise in not just Tkinter but also PyQt and Kivy - all of which are potential candidates for your GUI development. In fact, I've even developed customized libraries that allowed for easier button clicks handling and smooth drag-and-drop actions. I can guarantee swift delivery of high-quality service meeting your exact specifications. Let's chat and get started!"