Hello there. Joining Google is a dream for every engineering aspirant. And as for joining Google, their are not any as such hard and fast rules. You can visit the official site of Google and check out for the carrier section out their and you can get all the information about how you can join Google. Please visit the given link and you can know all what you want to know about how to be a googler.
https://careers.google.com/how-we-hire/
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