I have had very good experience with Rama Givoah, run by
Yitzhak Treister in Beit Shemesh.
He acts as an employer for freelancers and issues you a salary with a
Tlush at the end of each month based on your receipts.
It is a small company which means that Yitzhak is able to personally
be involved and advise you on a solution which bests meets your
Yitzhak's contact details are as follows:
Office: 02-999 5625
Cell: 052-385 7254
Fax: 02-991 7578