As management thinker Peter Drucker famously said: "Culture eats strategy for breakfast". When startups scale, they have to organizational address culture. But how do startup founders - often unaware of the informal culture that rules and how their professional identity impacts it - become cognizant of culture? They have a myriad of priorities address, from product innovation to making customers happy and keeping the venture capital community happy. I reflect on the interplay of increased pressure due to scaling, leadership personalities, team happiness and getting culture right.