This is a rather simple tool I created using Selenium to automate the Windows Store build uploads. I became annoyed by how much time this consumed so I fixed that.
The only dependency is the chromedriver for Selenium to use. You can download it here. Once downloaded, please add the location to your PATH so that Selenium can find it.
I wanted to use PhantomJS but uploading the builds seems to fail there for now. I will update the code once that works or feel free to fire up a PR in case I take too much time ;-)
Compile the code and use fastlanium.exe to upload your builds:
fastlanium <username> <password> <appId> <package>...
You can add as many packages needed as the last arguments, everything will be uploaded.
The tool will not work if you have 2 factor auth enabled on your account (obviously).