Please include three (3) letters of reference with this application. Finally, review your application before submission to ensure all sections are complete.Fill out our Job Interest Card form and subscribe to our job announcement service. List experience that relates to the qualifications as required on the job announcement. Welcome to Contra Costa County's on-line application process! Sample Job Application. Fill out the form below to create a new account. Please do not use your email address, special characters or spaces in your username or password. Interested candidates, please send resume and necessary credentials (ie: permits, credentials, etc.). Pre-Employment Interest Form.