I like the craftsman analogy, and have used it myself. Maybe to attain "master" certification, software developers should be required to create a "masterpiece" the same way as craftsmen of old (this being the origin of the word - a piece of work that demonstrated your master-level skills).
Perhaps a compiler or something of similar complexity would be appropriate as a software "masterpiece". What else, I wonder?
I'm not sure what you're referring to as "BEAM". Google throws up a bunch of different software related things.
An operating system such as UNIX would for sure count as a "masterpiece", but I think that's really too big of a project. Should really be something that a single "master developer" could complete in a few months, or less than a year at least.
Perhaps a compiler or something of similar complexity would be appropriate as a software "masterpiece". What else, I wonder?