Like all professions, it's a range of experience that separates junior from senior level positions. In my article about being a programmer I indicate there are several skills that define a programmer beyond just coding.
I'd expect a junior programmer to be versed in only a few skills and need a lot of assistance in producing a project. I'd expect a senior programmer to be able to manage, on their own, their relationships with all development staff and be able to effectiely prioritize their work, along with mentoring the junior programmers.
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