After-school nanny/babysitter needed 3 days/week in Redwood City

We both work at Stanford and are looking for someone fun and energetic to pick up our 4yo twin boys from preschool (in Foster City) at 1pm on Tuesdays, Wednesdays and Thursdays and care for them (in Redwood Shores) until about 6pm. Must have own car and a clean driving record. Someone who also could occasionally be available Tuesday or Thursday mornings when the kids have a school break would be a huge plus but not required. Must be able to commit for at least this academic year.