The following article is in Spanish only, if your Spanish is advanced or fluent and you possess one of the skills listed in the article (Teachers of English not included, there are now too many qualified English professors in El Salvador)you may probaly make it in El Salvador, however salaries are low compared to US or European standards, but housing and rents far lower.
http://www.elmundo.com.sv/economia/6652-las-10-plazas-mas-dificiles-de-llenar.html
Buena suerte.
It helps to know people here in El Salvador or be married to an El Salvadoran Citizen, of course, with an vehicle one can easily commute from Beach house to capital city.