I would say that such a job posting could become a reality by 2030 or 2050 by the latest. Today artificial genes are made and assembled into plasmids that are then inserted into bacteria. These bacteria then read their new instructions and create useful substances used by various industries. So in a sense, custom made organisms are already here.

I have also read of a group trying to produce a real life unicorn. The head of this effort claims that if successful, they would make a killing off of the sales. Just imagine all of the kids (and adults) that would want their very on unicorn.

Lee, (In the near future, life will become as clay, and the geneticist its sculptor)