Enjoy weird fiction overall, sci-fi and “horror” (in a very general sense). I like some Lovecraft, VanderMeers, Ballard, China Miéville, Samanta Schweblin, late William Gibson, Mariana Enríquez… what recent books or writers caught your eye that may loosely fit the term or are similar to works of the above authors? Can be in English, Portuguese or Spanish.
The science in Permutation City is truly mind-warping, if you really try to wrap your head around it. One of my favourite books.
Egan’s short story collection Axiomatic is full of heavy concept scifi in a similar vein to it.
Yeah, knowing a fair bit about the way computers actually work at the hardware level, some of the details of how the virtual world functions are hand-wavy and kind of magic-disguised-as-technology. But Egan makes more of an effort to try to explain how the simulation works than most other fiction that describes similar virtual worlds - and ultimately the crux of the story is how people behave in a world of their own making.