Cytonic is the third book in the Skyward series by Brandon Sanderson, following Skyward and Starsight. For some reason I thought this was a trilogy but it is at least 4 books long. There's also a handful of collaborative novellas in this universe as well, though I have yet to read those. Regardless, this is a very interesting sci-fi series from an author better known for fantasy.
As part of a series, the prior books are fair-game when it comes to spoilers, but I'll avoid major ones here.
