Babysitter Needed for my Children - Full-time / Part-time

We have two granddaughters that require occasional workday caregiving. They are 4 and 3, both level 1 ASD and speech delayed. When my husband and I are filling in caregiving we would love some extra help. Most of the time both or 1 of us would be there. We have a large house in Medford and would only be present if needed. Ideally we would like to have someone who is ABA, ASD. Speech trained, as we would like them to receive services while with us. Hourly rate can be negotiated. Thanks very much.