In the past few years, the labor market in Porto has suffered a considerable boom. There are far more opportunities now that the 2011-2015 crisis is apparently water under the bridge, with new businesses and new companies growing as days go by. Be that as it may, you should definitely do some research about the specific area of work you are looking for, as the Portuguese economy is famous for running on low wages, making it increasingly difficult for the average Portuguese worker to afford to live in the big cities.