And yet, even companies like pager duty, who have “one job” and hire many competent engineers, still struggle with this: https://www.pagerduty.com/blog/outage-

And yet, even companies like pager duty, who have “one job” and hire many competent engineers, still struggle with this: https://www.pagerduty.com/blog/outage-post-mortem-june-14/ https://www.pagerduty.com/blog/outage-post-mortem-june-14/ Note that pager duty now weathers Amazon outages beautifully, but the point is that amazon doesn’t have 100% uptime and that properly designing distributed systems is very hard.