The following information will assist you in applying for jobs with Fairfax County. You may also download this helpful brochure to assist you.New applicants can apply online to be a substitute teacher or substitute instructional assistant through the FCPS Instructional Talent Gateway. This guide describes how to apply for jobs using the Career Page web site. The process consists of the following steps: Apply to Elementary School Teacher, Substitute Teacher, Mathematics Teacher and more! Complete and submit the online application to include three professional references with contact information, and provide a cover letter and resume. Fill Out Our Online Application. Apply to Elementary School Teacher, Teacher, Kindergarten Teacher and more! After a background check, the individual will receive an offer letter, and the hiring process will be complete.