As someone who has not only developed a multitude of robust web applications and handled complex data analysis but also worked on advanced system engineering, I have the foundation to deliver your screen sharing solution with precision. With an expertise in Python and WebRTC that stemmed from my involvement in various backend projects, I am well-equipped to address the specific requirements of your desktop-only screen sharing tool.
A key aspect for successful screen sharing is cross-browser compatibility, to ensure a seamless experience for your users. In this regard, I've had extensive exposure to handling such challenges and can employ solutions tailored specifically for this requirement. Moreover, my acumen in database architecture and cloud DevOps will come into play for efficient data handling and storage so that you can obtain maximum performance for your platform.
Lastly, but not the least, I believe that my foundation in HTML5 and JavaScript would give me an edge in delivering precisely what you need; without any audio or chat session functionality. So, if you're seeking a WebRTC expert who is well-versed in cross-browser compatibility issues, backed by years of experience in backend development, cloud DevOps, and databases - then look no further than inviting me to work on this project for you!