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Re:Amazon has sold no more than 35,000 Fire phones, data sug... by pzb on Wednesday August 27, 2014 @01:23AM (#8230938)
Principal is a job level. It is above Senior. A single product frequently has multiple Product Managers, some of whom are Senior PMs, some are Principal PMs, and some are "just" PMs. You could even have a Senior Principal PM.

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