Can I just submit my resume and a cover letter to apply for a job? No. You must submit a completed application for each position you are interested in.You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. We can help you discover rewarding career paths, find a job, write your resume and cover letters and even get ready for interviews. 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. A resume or other supporting documentation may be attached but it may not be used as a substitute for completing this section. A). Dates (Month, Day, Year). Resume Help; Interview Preparation; Job Placement Assistance.