You say you're hiring for Product Designers, but there are no open positions on https://www.cloudflare.com/join-our-team. How can I find out more about this?

Contact our recruiter, ed@cloudflare.com, and he will take care of you.

I love this! Bit of feedback: if I were to use this to share photos taken for a client, I would love a way for my clients to be able to download all the photos in one go.

Yes, that is the biggest feature people have asked for. I'm trying to figure out the best way to do it.

Quick question. Would it be ok if you clicked a link and then it emailed you a bit later when the download was ready?

You could do it how Github (at least used to) do the tarball downloads for specific commits. You would click the button, which would turn into a twirling thing, the server would generate the file, and it would use ajax to actually start the download once it was ready.

How about bittorrent sync for that purpose?

I don't know much about bittorrent sync. How does it work?