One of the best things you can do is ask. I can't imagine anyone being upset about you wanting to work and being proactive about it, especially as a new developer. If they do get mad about that then you pretty much have your answer right there. In the meantime try to get a feel of what the code is doing (broad scope) so that you are better able to take on work that does come your way.
Great advice: 1) ask 2) be productive.
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