A good developer gets the "big picture" of a large project and identifies smaller parts, appropriately breaking large tasks into smaller ones, and then focusing on those smaller tasks, one at a time, handling overlapping tasks right away (this involves listening skills as well, so you can know what your coworkers are doing).
Not all developers can see a "big picture" of a large project because of their entire professional competence. That's why it's essential to have a senior developer - mentor beside them.
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