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Re:Amazon Echo Flex: Microphone mute button appears to be re... by dom96 on Tuesday January 12, 2021 @03:57AM (#25744103)
What’s the PE in “Amazon Devices PE” stand for?
Re:Amazon Echo Flex: Microphone mute button appears to be re... by chaboud on Tuesday January 12, 2021 @05:16AM (#25744744)
Sorry for the jump straight to the abbreviation. "PE" stands for "Principal Engineer".

Amazon's Software Engineer level progression is:

SDE1->SDE2->SDE3->PE->SPE (Senior Principal, Director Level)->DE (Distinguished Engineer, VP Level).

Re:Amazon Echo Flex: Microphone mute button appears to be re... by unwind on Tuesday January 12, 2021 @04:17AM (#25744256)
My random guess would be "product engineer [1].

[1] https://en.wikipedia.org/wiki/Product_engineering