Au Pair/Nanny Websites
Their are many online websites including this site that offers an Au pair online matching service, the operation is if you are looking for a job you normally register as an Au pair/Nanny this is normally free and makes your details available to potential families who are looking to offer the right Au pair a job. Then you will go through many matching options until a family is found and you will be able to search for families who are offering an Au pair/Nanny Job, when you have found a family you like contact can be made for a small fee.
For families the operation is very similar you register your Au pair/Nanny job, this is free and then this will publish your job on the site for it to be searched and found by potential Au pair candidates. Also you will be able to search Au pair for free using many search options on the site when you have found your suitable Au pair you will be able to make contact with them, this requires a small fee for 3 months access.