What will I need to complete an application on-line? It's important for your job applications to be complete and accurate.No. You must submit a completed application for each position you are interested in. The purpose of this form is to gather essential information from applicants seeking employment with Contra Costa County. Click on the job title, and then Apply, to complete the application. Welcome to Contra Costa County's on-line application process! Registry Provider Application Form. All applicants to the Public Authority Registry will be required to undergo a Department of. If you are not working and the Commission's website won't allow you to renew online, you will need to renew with form and fee.