It looks like a take on the million-dollar-homepage (https://en.wikipedia.org/wiki/The_Million_Dollar_Homepage).

Never hovering or clicking on resumes work for me (Firefox latest).

You’re spot-on about the Million Dollar Homepage inspiration – though instead of ads, this is a crowdsourced résumé experiment for devs. Think of it as GitHub’s contribution graph meets a community art project. If you are facing the click issue try double clicking it.

I've tried clicking and double-clicking.

Are you sure this works on Firefox?

I don't feel like buying a square that I can't click myself.

Bold claims for a no mobile view website,

Fair point! We launched desktop-first to nail the grid’s core mechanic (it’s surprisingly hard to drag blocks on mobile).

Where can i upload my resume in this.

I think you buy squares.