@howo did you hire them full time or just to delivery something? I live in Brazil and there are great companies with great devs, if good developers didn't exist here don't you think the software industry would be non existent? you sound like you hire someone to do one job, not to be part of the team, 100k USD is almost 400k in local Brazilian currency. that is a budget of 33k a month in local currency, enough for 1 senior software engineer (15k), 2 good devs(5k) and maybe a few trainees with some experience , you can easily get a team compatible with the agile methodology (around 5 people with hierarchy for the project) for 1 year.
Of course numbers are not everything, but I am curious how many people did they get for that price and what will they delivery in just two months.