The hardest thing for most first-time engineering managers is getting used to the fact that the sum of your importance is now far beyond simply the code you write or the infrastructure you design. Your job just got a lot harder, you need to balance more distractions and learn how to keep yourself out of too many critical paths. If your first answer to every problem is “I can just bang that out,” you’re probably doing it wrong. You probably have more meetings to go to, at the very least you need to have 1-1s with everyone who reports to you, ideally once a week. All of a sudden, managing your time will become one of your most critical skills.
On Distributed Systems and Engineering Management, interview with Camille Fournier in MVC