Yes, there is and the name of the company is in the local newspaper. But, you know better than the newspaper.
I have no doubt there are companies who will supply petition workers, but we will have to agree to disagree as to whether the respondents are actually professional.
Be aware that the List of Persons is available for a nominal fee at your City Clerk’s Office. It comes out every two years and contains your name, address, occupation, age, Sex, party affiliation and your voting status if “Inactive”. Signature Gatherers get paid by the signature. So do those who steal the votes of the “Inactive’.
Poll workers are not "professionals". There are only three types of "professionals of record": Certified engineers, lawyers, and doctors.
The polling company is not professional, and its workers are hired hands.