Babysitter - Full-time / Part-time

Looking for a highly qualified nanny that can help watch my son, as needed. Must have 4 references from previous parents, must be CPR Certified, First Aid- Certified and have a clean background check. My son is 4 months old and mainly stays with his grandparents during the week while my husband and I are at work. Looking mainly for someone that can be flexible when the grandparents are unable to watch him and when we want a possible babysitter for a date night occasionally.