List experience that relates to the qualifications as required on the job announcement. You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553.Contra Costa County is seeking talented and qualified individuals to fill clerical vacancies throughout the County! Please fill out and print form, and attach supporting documentation. Once your application is complete, click on Proceed to Certify and Submit. Click here to apply for an initial CCW permit, renew a CCW permit, modify an existing permit, or to obtain a duplicate of an existing permit. Click here to apply for an initial CCW permit, renew a CCW permit, modify an existing permit, or to obtain a duplicate of an existing permit. Cover letter explaining your interest in the position. We can help you discover rewarding career paths, find a job, write your resume and cover letters and even get ready for interviews. If you're in the process of getting hired for a job, the offer letter is crucial as you'll need to accept and sign it off before you get started.