>doesn't specify what level of knowledge is expected of you. Familiarity? Proficiency? Master? Do you need to know how v8 interprets Javascript?

It says "experienced with OO JS". That's vague, but not so vague that it can mean "I don't even know the basic operators of the language".

And that from someone who claims they can "teach others to code". (http://notlaura.com/services/teach-me-to-fish/)