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I really enjoy Scalzi, so I was surprised when I didn't know about the Interdependency series. The nice thing was by the time I finished Collapsing Empire the second book in the series was released (The Consuming Fire). I haven't started it yet, but it's next in the queue!

I found the Red Rising books to be stilted, narcissistic and implausibly Manichean, FWIW. I made it through the first one, the second one was just too plagued by characters making implausible choices and the protagonist scoring implausible successes.

You should add Expeditionary Force then. Best light sci-fi in my opinion.