Hello! I’m a native Portuguese speaker and also fluent in English.
I don’t have any certification but, as I like to say, life is my biggest certification. I ran a hostel by myself where 85% of the guests where not Portuguese, so I spoke English on a daily basis. I basically learned English by reading a lot of books as writing reviews about them that you can find on my blog (underthepages.com).
I have some experience translating English-Portuguese and also proofreading, even in the engineer field since I’m mastered in industrial engineer. I am also available to do Portuguese-english.