Half of the expectations set when interviewing were not met (office was not kept in the city centre, a lot of legacy code, most of decisions still being taken completely in Berlin, impediments to WFH regularly...).
From the organisational perspective, a lot of changes in the past months (groups/teams structure, ways of working, on call...) that give a significant sense of chaos (and not all of them can be justified by hyper-growth). Many people that were there from the beginning left because of it.