The moral, ethical, and halachig implications of “bluffing” are clear, and need not be discussed (though perhaps, as discussed in a different CR thread, we might take a Kotzker approach and call it what it is: lying).
That aside, consider the following: a person fibs/bluffs/lies on his/her resume to boast of academic or prior work training. He/she is hired on that basis. Subsequently, the person is asked to assume responsibility for a project that demands the experience the “lie” purported to confer. Project fails. (1) person is professionally compromised, to say the least; (2) person could conceivably cause losses for the company or pull others down with him.
There is nothing wrong with using positive descriptive language to trumpet your accomplishments, or to use grand adjectvies to describe you achievements. But you cannot out-and-out lie.
We klop an al cheit on yom kippur for the type of speech that is intended to give a false impression of the facts. Perhaps the following should be our guide: would it be a resume you would submit to the RbS”O?