The problem is that there is a belief in the industry that 15-30 minutes of technical interviewing tells more about a candidate than that person's entire career history. I have seen no actual data to support this belief.

I think someone who has a history of having built successful applications is far more likely to be qualified than someone who happens to have a good memory for algorithmic solutions and performs well under the stress of an interview situation.

This interviewing approach may make sense for entry level candidates who have nothing more to show than what they have learned in their CS classes but applying it to an experienced professional is simply brain-dead.