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'. 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. An incomplete application packet may disqualify an applicant. This document is the official Employment Application for Contra Costa County. It includes required personal, educational, and employment information. Sample Job Application. Application Process - Completing and Submitting an Application.