@mauve I'm almost done with the second book in @adapalmer 's Terra Ignota series. It's hard sci-fi, except for it's main plot device :D
@mauve I recommend Never Let Me Go and Klara and the Sun, both from Kazuo Ishiguro. These books are very well-written but the sci-fi part is only the background of the stories. (And the transhumanism theme is present there.)
Blindsight, Peter Watts
Hard scifi, transhumanism, aliens. Really unique.
Can also read / download free on his website: https://www.rifters.com/real/Blindsight.htm
@mauve oh perfect timing honestly! i was thinking yesterday about recommending you a series?! have you read the Schismatrix Plus series by @bruces
great sci-fi epic detailing shapers (biomod-style humans?) and mechanists (hardcore merging w/ machines) and the conflicts btw them from the pov of the protag