[earth2mars]

first: build trust with rest of the management. And you do that by delivering results they need in the beginning. If you come across things you disagree as you do these, collect data points, anecdotes so that it will help you to build strong argument second: push for culture change once you have established the trust to have open conversations. something similar to amazon's leadership principle "disagree and commit". I recommend looking at amazon LPs in this case which clearly summarizes the culture of disagreement (not that its a perfect company, but at least the principles are!) finally: it all boils down to building relationships, data which is valid/provable, earning trust (team, peers and upper management) and change the culture bit by bit before it comes super toxic.

https://www.amazon.jobs/principles