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I believe you're thinking of Paul Lutus. I just searched "apple nasa engineer" on DuckDuckGo, and his Reddit AMA was #5 and fit perfectly to what you described.

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hahaha omg, you're right, thank you so much. I was still trying to find it, I'm gonna give another try to DuckDuckGo.

He also hangs out here as lutusp IIRC.

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