Everything is better when you have a hand in building it afresh, and everything is worse when you come in later and have to maintain someone else's code. "What

Everything is better when you have a hand in building it afresh, and everything is worse when you come in later and have to maintain someone else's code. "What do I do?" - you learn to make it tolerable. If there's some tech debt that makese everything miserable, work on it. Get some satisfaction from that. If possible, start improving on the software so that you can have some ownership and agency in it.