Looking for on call babysitter, trustworthy, dependable, good with 3 kids

Hello! I'm looking for recommendations for babysitters that are on call. I have a unique situation as my hours go since I am a Doula and I am trying to find back up care for my 3 children if my husband or one of my family members can't watch them for me. I find it SO hard to trust people particularly where my children are concerned....so I thought it would be better for me to ask other parents and see where that leads me. Thanks so much!