It depends on what you mean. There's lots of ways of looking at this, but I'd think of "entry level" as someone who is assigned individual tasks, and maybe needs help or oversight on completing them. Someone senior is assigned a project, or even a problem (and certainly has input on which projects they work on), and can handle the entire process of investigating, proposing, designing, and implementing the solution to that problem, which may involve oversight or tracking of other people.

Staff+ is additionally directly influencing which projects the org is prioritizing.