Experienced Part Time Overnight Nanny/sitter

We are looking for a very experienced overnight nanny/sitter who can spend a couple of nights during the week to be with my son if he wakes up during the night so we can sleep and also tend to our beautiful senior animals. The platform would not let me put in the overnight hours so right now I have it set to 8:30 a.m. to 8:30 PM, but it would actually be swapped, you would come around 8:30 p.m. in the evening and spend the night in our guest room and leave around 8:30 a.m. the next morning. We also have a full-time nanny during the week however we are also looking for someone who could be a backup in case she's not able to come on occasion so if you are also available during the week as a backup on an as needed basis, that would be a bonus! Thanks.