To apply for an open position on the job portal, click "Apply Online" at the bottom of a job posting. Start with a draft of your resume.The cover letter will follow once you've identified an opportunity for which to apply. You can type directly into the Cover Letter and. Apply for Administrative Assistant - Conference Office. Please fill out the form below and click Submit to submit your application for consideration. Thank you for your interest in applying at Allegheny County. The following information will assist you through the application process. Cover letter that states the position for which you are applying. Take a look at our careers portal to see current openings.