Roles expand and shift at a breakneck pace in a high-growth startup, says Meebo co-founder Elaine Wherry. Interns find themselves in charge of massive, mission-critical projects. Engineers are suddenly tasked with hiring and managing multiple teams. Wherry shares her insights on how to thrive in a rapidly expanding technology venture, drawing on the heady years between developing Meebo’s initial instant messaging platform in 2005 and landing the company at Google seven years later.