Open Positions A separate La Frontera application form is required for each position - we do not make photocopies. Applications are available in the Human Resources Department from 8:00 - 5:00, Monday - Friday. Positions are open until filled. Applicants must be 21 years of age. Persons working in some service areas are fingerprinted and must receive clearance. All jobs require an Arizona Motor Vehicle Report and proof of liability insurance prior to a job interview.