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server stack = the software you're using as your server. For me, that would be node.js + mongodb. I think what you're asking for could be done without too much trouble. I'm reluctant to ask for money in exchange for this sort of help...do you want to learn on your own how to make your app, or would you like me to guide you through the process...? I don't know of any "off-the-shelf" solution to your sort of problem...there's a couple of node.js modules you can use to help with uploading and downloading, but to make what you're talking about you need to know how to put it all together.