Sitter Job in Woodbridge, Virginia

We are looking for someone to be our backup sitter for our 14 month old twin daughters in Woodbridge, VA. We have a full-time sitter but occassionally she is ill, on vacation, or unavailable. Person would need to be available to come to our home from 8-5 or a variety of hours in between during the week and some times on Sunday. My husband is a RN and works nights so he would be home sleeping while you are there. There would not be a guaranteed # of hours since the position is on an "as need" basis. We are looking for someone with several years experience, experience with twins a plus, non-smoker and ok with pets since we have a dog.