As a native Spanish speaker, I don't know of any successful tech community in Spanish. Vast majority of them just republish news from English sources with lazy translations.
So it may not be the best idea to learn Spanish this way.
With that said, I do know of two popular ones:
https://www.xataka.com/ and their network of sites (Webedia, see page footer)
News and sometimes discussion in various topics, mostly technology, hardware and random gadgets.
Mostly written by Spaniards or Mexican authors, but don't expect a lot of original stuff.
https://elrincondelc.com/foros/
Somewhat popular but small community for general programming questions.
