What does experienced non-manager mean in career levels?

In the context of career levels, an experienced non-manager typically refers to an individual who has accumulated a significant amount of expertise, skills, and knowledge in their field but does not hold a formal managerial or leadership position within an organization. This person may have several years of hands-on experience in their role and may be considered a subject matter expert. They are often relied upon for their technical proficiency and may serve as mentors or trainers for less experienced colleagues.