Spanish is pretty good: EU member and we can travel to most of our old colonies and Brazil (among others) without a visa. We can also get job permits there pretty easily if needed, or work under the ingenieros Telefónica system, so called because it was first exploited in large amounts by that company. So long as your salary comes from back home (not from the country you are visiting - if it comes from there you’re not a visitor any more), you can go on “business visits” up to 89 days, leave for a month, reenter. Customs people are familiar with the method and don’t have any problem with it, it’s perfectly legal.
When I lived in the US travelling to Latin America I kept having this discussion with Corporate Travel*: “hello, this is Nava, I requested this ticket and still don’t have it, do you have an ETA for it?”
“We need the record of your Visa before we issue the ticket.”
“I already sent you the documents indicating I do not need a Visa.”
“Yes you do, US citizens do need a Visa for [location]”
“OK, do you have my file open? See right under my username, where it says ‘nationality, Spain’? I need a Visa for the US but not for this trip, please issue my ticket.”
During that same period, visits to Mexico required Work Permits but the first one took half an hour at the local consulate and renewals were even quicker.
- I suspect CT jobs may carry an IQ test: if your IQ is above 85 you can’t work there.