Data fetching for public online ecommerce platform - 2 sites

I need a customized program to fetch data (and calculate) from an online ecommerce platform. The program shall be able to run 7x24 in a VPS environment. Developer shall suggest a reliable and low cost VPS provider. Output excel file for each fetching shall be uploaded to Google Drive. Only the latest file shall be stored in Google Drive - that is old file shall be cleared from Google Drive. Developer shall be able to handle platform robot detection, captcha, proxy blocking etc. If proxy service is required, developer shall advise such service provider and monthly cost, in addition to handle the work. Good database design and management are necessary. Developer shall provide 3 months warranty to ensure the program can run 7x24 in VPS server. Document and all necessary information shall be provided to ensure buyer can have 3rd party to do maintenance work (both the script and VPS set up details). Buyer will pay for VPS and proxy service every month. Developer shall include the cost for proxy service required during development and testing. Only serious and professional shall contact me for detail.