Full time nanny needed for our two preschoolers

We have two kids, ages 3 and 4.5. Both of us work full time and so we need full time care for the kiddos. Duties include taking kids to and from preschool (one goes four days per week from 9-12 and the other goes two days per week 9-12), activities, playground, etc. Feed breakfast, lunch, snacks and sometimes prep dinner. Light housekeeping if kids are at school. Reliable caretaker needed. We work full time so this is not a flexible job, days are M-F 8-5:30.