While a senior recruiter will participate in the expected recruiter tasks of creating job posts, sourcing candidates, and interviewing and onboarding them, senior recruiters will also participate in creating recruiting strategies and overseeing the hiring process. Senior recruiters will work under little supervision and may act as supervisors for more junior recruiters. You will usually be expected to have at least 3-5 years of experience as a recruiter to qualify for this position.
Here is a strong senior recruiter resume to have a look at.