Senior developers work for less than USD20K here
We're investing a lot in expansion in LatAm at my other company - and one thing I learned about Argetina's job market is that you have 2 tiers of developers: one working mainly for internal market and the other - for US customers. The salaries may differ by the factor of 3 or even more.
Here is a great piece of research about similar situation in Europe: https://blog.pragmaticengineer.com/software-engineering-sala...
Actually, the idea of Greenlight has a lot to do with this salary gap phenomenon. I see this as a big potential for a win-win.