I've held off rewatching Rogue One until Andor season two finishes, so the former isn't fresh in my mind, but there is plenty of character development in Andor. He's the "guy who gets shit done" but at the beginning of the show, he's reckless and only in it for himself. In that season he sees first hand how the evils of the Empire affect his life, recognizes how his selfishness negatively impacts those around him, sees what it means to be part of something bigger than yourself, and is able to (sort of) move on from a life that revolves around his missing sister. The Rebellion gives him something to focus on and be apart of.

The ending of episode 6, exactly halfway through the season, is also a perfect midpoint for this arc. He's approached by somebody that's in it for themselves, and the reckless, reactive part of Andor reflexively shoots him. He's refuting the selfish part of himself that would have done the very same thing, but the reckless "shoot first think later" part of him is still alive and well.