Typically in organization personnel have primary roles and roles that have different contexts. The primary roles are usually tied to their official job titles developers, testers, managers etc.
The 'primary' roles are helpful in organizations for others to understand what they can expect you by default. The secondary roles are what others can expect of you in a workspace.
Organization Roles can be defined in the Organization Settings page.
You can access the Organization settings page:
The primary role of a user can be assigned to a user through the workspace members interface.
This is shown on the user avatar card in the workspace.