In my experience, most countries want you to have a working visa when you intend to do a job that someone else in that country could be doing. Immigration law/p

In my experience, most countries want you to have a working visa when you intend to do a job that someone else in that country could be doing. Immigration law/policy hasn't really caught up with the Information Age in this respect... But as long as you aren't in a country working for clients in that same country, the country isn't going to care. I guess it's similar to how visas work for writers. There are artist visas for writers, but they seem to exist so the artist can stay longer.