Ride-hailing service Careem, the “Uber of the Middle East,” experienced expansion so dramatic that it monitored its growth target every 15 minutes. Was this a fabled startup unicorn? But doubling the size of the company every six months took its toll. Harvard Business School professor Shikhar Ghosh discusses his case, “Careem: Raising a Unicorn” — how the founders approached a number of critical organizational and cultural issues to keep its 4 million customers satisfied.