I am looking for a longterm part-time babysitter, for pickup from school at 3:30, walk home...

I am looking for a longterm part-time babysitter, for pickup from school at 3:30, walk home (takes about 10-15 min), assist with snack preparation, homework help, and playdate supersion, etc, until about 6pm. My kids are 9 and 7 years old, both are friendly and well-behaved. This position would ideally suit a responsible, reliable and trustworthy university student, possibly a female graduate student who enjoys being around children and looking to supplement their income. Must be reliable, responsible and trustworthy.