Head of Let's Encrypt here. We have an on-call rotation and a system for getting others notified and online quickly when necessary. We make sure not to bring t

Head of Let's Encrypt here. We have an on-call rotation and a system for getting others notified and online quickly when necessary. We make sure not to bring too many people online so that some people are fresh and can rotate in later if the incident lasts longer. It's not often that staff have to put in time at night or on weekends, and when it happens we work hard to make sure the problem doesn't happen again.