List experience that relates to the qualifications as required on the job announcement. Contra Costa County only accepts online applications.When viewing a job posting for a currently open examination, you can select the option that says 'Apply'. How to fill out the Contra Costa County Employment Application Form? 1. Read the instructions carefully. 2. Click on the job title, and then Apply, to complete the application. You can use Remove if you want to delete an application without completing it. We can help you discover rewarding career paths, find a job, write your resume and cover letters and even get ready for interviews. Denotes a required field. To initiate the application process click the Apply tab.