Unless one's title is going to be "VP" or "SVP", the chance that someone joins BigTech and gets to "improve the process" is usually miniscule. You're being hired as cog #21 on team #54 and there is a large backlog of JIRA (well, in this case, Radar) tickets to grind through. There will be people who tell you what the processes are, and to not deviate from them. And you shouldn't get mad at those people, either--they're just the messengers, and were told what the processes are by people above them on the totem pole and so on.