The problem KZILLA.XYZ solves

KZILLA.XYZ is a simple stupid URL shrinker that I made as a pet project. KZILLA.XYZ shrinks your long links into really short links. But that's not all. It tells you how well your link in performing with analytics of regions, operating systems and browsers. To make the experience magical (and still loginless), KZILLA.XYZ uses cookies to help you manage your existing links link disabling them, changing where they point to and even letting you download a QR code of the short link that you can readily stick on that poster of yours. With caching at the back, KZILLA.XYZ speeds up the user's experience by a factor of four!

And I am sure you'd love my designs:)

Challenges I ran into

I wasn't able to test the cookies until we deployed everything on the same domain. Discovered how browser policies work.