Not sure what the percentage is. I've had to deal with a pretty massive scale at the last two companies I was at, over ten years now. I think as builders of things, we all hope that our things will become popular. If they do, then you have to be able to scale to meet the demand.

It's been really fun learning how to build an application that can handle tens even hundreds of thousands of requests a second. It's perhaps not a common challenge for most, but it's wild to set up a whole infrastructure that can do that and see it working is highly satisfying.