A lot. There is not senior management that focuses on strategy, as a BM we were at time (repeatedly) to hire more engineers, then a couple of weeks later we were told to fire engineers (one of many examples).
Some of the managers will stab you in the back, and I know of some 'coach' managers who stole the accounts of their team in the process getting them fired.
The business priorities on reducing cost with out understanding the impact on quality, the company already knows that the pay is in the bottom quartile of salaries in the UK but will not make a change. preferring to instead sell the benefits of exposure to other industries to compensate for this, however as most engineers are fired after their first project this is of no benefit, and for the other functions like BMs most leave in less than 2 years and so it too offers little cv benefit.
you will be micromanaged, not all the senior managers are bad I can think of 2 who I really like, but the rest are either terrible humans or are very new in the business and likely will not last long.
the MD has pulled all the BM team in a meeting and showed a ranking of everyone, regardless of if they were new to the business there for a while or any other qualifier. all but 4 were underperforming (out of 40)
targets and metrics - the targets are impossible, and the metrics are pointless.
Creating a lot of friction and frustration. and action to change the ways of working that might risk slowing the metrics is strangled in its infancy.
I know of 2 BMs who took long term sick leave due to mental health issue caused by the job.
and final point i can be bothered writing, if you do not like lying to engineers (most of whom are young and idealistic) or your clients you will start to find this role sole sucking after about 6 months at best.
