Hello! I am a professional programmer with many years of experience using Python. I have read your project description, and I can create the Mass Product Uploading program you require. To do so, I will use the libraries Requests (for web automation tools) and Selenium (for working with AJAX and Javascript). Using these technologies, I can automate the upload process. I have written very similar programs in the past, and I can have this completed within 5 days. Please contact me so we may speak further and so I can send files. Thank you for your consideration.