A senior developer will understand that this job is to provide solutions to problems, not write code. Because of that, a senior developer will always think of what they are doing in terms of how much value it brings to their organization and their clients vs how much effort they are putting in.
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A senior developer understands that you cannot do everything yourself, and that their primary role is to help their team get better, in many of the same ways they themselves strive for personal improvement.
A senior developer understands that leadership is not about power, it is about empowerment. It is not about direction, it is about serving.
Очень хорошая статья, которая удачно раскладывает мои впечатления по трем поименованным корзинкам.