Part-time jobs are always viewed as value in the college admission process. It shows responsibility and showcases an applicant's ability to manage their time and academic course load. It is always impressive if an applicant's job is related to their choice of major.
Nonetheless admission officers are impressed and look for consistency, time on the job and gradual increase of responsibilities.
And most importantly...for those colleges that allow for an "other" letter of recommendation the applicant should ask their supervisor. That letter will give an
outside of the classroom glimpse as to who the applicant is.