List experience that relates to the qualifications as required on the job announcement. Finally, review your application before submission to ensure all sections are complete.An incomplete application packet may disqualify an applicant. What is the Close Date on a job posting? How do I complete an online application? You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. 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 have various applications and forms available on our web site for your convenience. Form Number, Video, Date Revised, Form Name.