You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. Open examination -- Any persons qualified for the position may apply for the examination.Hello, I applied to be an Experienced Clerk for the County. My first assigned interview is for the County Counsel. A cover letter of 300 words or less, explaining why you are the ideal candidate for the students at Contra Costa College. When replying to a job offer letter via email, you'll want to express your gratitude for the offer and confirm your acceptance of the position. The Workforce Development Board of Contra Costa County offers a variety of services to help job seekers looking for employment and career opportunities. An outline of the employment process in this District appears below; each letter corresponds to a step in the process. Through in an attempt to obtain employment in the Contra Costa Community College District. To fill out this application, ensure you have all necessary personal and employment information ready.