Babysitter Needed - Full-time / Part-time

We are looking for a long-term, part-time nanny for our two children, a boy (7 months) and a girl (3 years old) beginning in late June. Mom works at U of Michigan and Dad works from home in tech. 20-25 hours per week, hours would be around 9-1 or 10-2ish, Mon-Fri (some flexibility in specific hours and depending on family and nanny's schedule). Our toddler will be in part-time preschool the majority of the nannying hours beginning in September, so most of the care will be for 1 child. Primary responsibility is caring for our 7-month-old (naps, play, feeding, etc.)! Cleaning, cooking, picking up toddler from preschool, etc. is not expected. We are a non-smoking home, and we have no pets.