Employment agencies in Brazil

Ola Chris,
I really do not know the SP area that well, but I certain someone can address agencies.
You may be premature since a CRNM will have to be issued in BR. Additionally, upon receipt, of your CRNM you will need a work card, again issued in BR.
Once that is done you will face the "Brazilain First" work laws.
The first step is made by your future employer in Brazil who will apply for a work permit at the Brazilian Ministry of Labor and Employment (Ministério do Trabalho e Emprego) by submitting the work contract and a set of other documents.
In this set of documents, one will be a statement saying there are no Brazilians that can do the job. Know that wages are very simple in Brazil and will not be anything near what you have earned.
It can and has been done, so do not get discouraged.
Good luck

Chris,

As Tex says, you'll only be able to get your Labor Card to work legally after you've applied for your CRNM with the Federal Police, unless an employer has obtained it for you in advance.  The good news is that, as the spouse of a Brazilian citizen, you'll be issued your Labor Card right away after the Federal Police authorizes your residency, whether you've found a job yet or not.

As stated above, Brazilian salaries are low by international standards,  there are barriers to hiring even legally employable non-Brazilians, and there are high barriers to hiring non-Portuguese speakers.  This is a great time to be pulsing your network for jobs in Brazil with international companies.  If you can arrive with an employment contract in hand, you'll be way ahead.

Best of luck!