UK-AL is right, today is the day to be awesome. My personal answer is that the people working at Microsoft are awesome. We built this product in less than 90 days based on existing platforms; we were given the freedom and resources to do that. Awesome things are going to happen when we have that kind of environment.
I got asked a lot of questions about how we're built today and so I'm adding this comment for historical purposes.
We're built around WebJobs SDK and App Service, so much of the core work was done already and I had a plan in the works for a few months to bring Node support (I'm a Node.js nerd) to WebJobs. WebJobs has been and is increasingly popular, so it was a no brainer for our team to go and expand and promote it. It was still a lot of work to deliver a WebJobsSDK-as-a-service, but we knew we had a solid core and a great PaaS platform before we even got started.