Congrats mate! All the best for you in your first gig, you'll love it. I like how you leveraged GitHub and your side activities at school to make yourself look more credible.
First job tip? listen, learn, and repeat. Listen to whatever senior you work with. Learn from them. Repeat what you see in your code.
You'll have time to form criteria in the process, for now just be a sponge :D
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