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Where do we see that it was an intern ?

Clicking three links yields his LinkedIn that says "Software Engineering Intern at Google" https://ca.linkedin.com/in/arhamahmed

There's only one contributor to the repo, Arham Ahmed, arhamahmed, Computer Engineering Student (BASc) 2019 at @uWaterloo

And his github profile links to his linkedin page which confirms his status as a (for the moment) Google intern.

2019?

Date of expected graduation, probably.