To be absolutely honest, without speaking Portuguese on at least a basic conversational level you're going to even be lucky to find work as an English teacher at schools that will pay you a near-slave wage. Without speaking the language you'll be completely unable to communicate with your superiors and co-workers. In day-to-day life you'd be completely isolated here not being able to speak to neighbors, shop keepers.
You can't work on a tourist visa, you can't get a work visa unless you first have a work contract confirmed by a Brazilian company and Brazilian companies are required to prove to the Ministry of Labor and Employment that they've exhausted every effort of placing a qualified Brazilian in a vacancy before they hire a foreign national to fill it. The cards are stacked against us foreigners right from the get-go.
Please read the following two topic threads on language, the first one written by me and the second by a woman in Costa Rica who by her own personal experience highlights how important learning the local language really is.
William James Woodward, EB Experts Team