I know a developer who was learning two new programming languages and started writing serious production code within three weeks of starting his first job post graduation. He took over maintenance of a complex application and rewrote it in a new language. He managed to double his salary 18 months into the job. There risk in hiring someone unproven, but you can buy that down quickly.
The point isn't that they produced something shiny, but the quality of the code that backs it up. The link you presented did not link to any source code, but to a marketing blog. The quality might be horrible, but they shipped it.
I know a developer who was learning two new programming languages and started writing serious production code within three weeks of starting his first job post graduation. He took over maintenance of a complex application and rewrote it in a new language. He managed to double his salary 18 months into the job. There risk in hiring someone unproven, but you can buy that down quickly.