Some senior devs/engineers don't want to lead teams but they still should still have all of these skills. For example, team building is more than just the manager/leader doing it, it is the everyday interaction of the senior people and how they mentor and treat others (e.g. communication is critical) as this sets the tone for much of the team dynamics.
Increasing levels of responsibility doesn't need to mean a goal of management, just that they took harder roles with more responsibility and delivered.
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A clarification.
Some senior devs/engineers don't want to lead teams but they still should still have all of these skills. For example, team building is more than just the manager/leader doing it, it is the everyday interaction of the senior people and how they mentor and treat others (e.g. communication is critical) as this sets the tone for much of the team dynamics.
Increasing levels of responsibility doesn't need to mean a goal of management, just that they took harder roles with more responsibility and delivered.