Lightbringer. It's Pierce Brown's series about a slave caste of humans rebelling against their decadent, Roman-style aristocracy. Very much "You will own nothing and be happy" set in a hard sci fi future where humanity has colonized large parts of the solar system. The author does a pretty good job of capturing the sheer size of the solar system where interplanetary travel takes weeks or months, acceleration and deceleration dramatically impacts that, as well as realism about how easy it is for your telescopes to lose track of enemy ships in an area as vast as our solar system. Much better than soft sci fi where magic engines allows you to travel between planets in an hour, you can turn on a dime without turning your crew to paste, and "sensors" tell you everything you want to know from 10 AU out because technobabble.