Applications are available at the schools of all municipalities of Middlesex County. The Department of Personnel oversees the employment process for all full time employees at the five campuses of the district.Current Employment Opportunities. All open job listings are listed below. To establish a complete pre-employment file, please complete the online application. Your application will be retained in active status for one school year. Find out more information or begin the online application process at ESS. COM ESS is an Equal Opportunity Employer. By signing in or creating an account, some fields will auto-populate with your information. Middlesex County Employment Application.