A more useful answer: you do need to be ICAO 6 in Spanish and ICAO 4+ in English for ENAIRE:
This is last year's recruitment call:
https://empleo.enaire.es/empleo/OcupSrv?accion=salir Supposedly this year's should be pretty much the same conditions. Sorry, there's just the Spanish version of it...
For FERRONATS, if you want to venture in a low cost atc services you can check here:
FerroNATS / Our professionals / Join us
Don't know much about SAECO, they just provice atc services in the 3 twrs in the Canary islands:
Saerco | Personnel
Hope this helps, cheers.