Balancing risk and velocity is an SRE's main task. Being able to think in terms of Distributed Services allows ideas like SLOs, Canary Releases, Blast Radius, and Failure Domains to make more sense. This is an introduction to SRE principles through the lens of an organization that is transitioning their operational model as well as their serving platform. Embracing SRE can allow you move into the Cloud faster, at lower risk, and lets you operate more effectively when you get there, however some mental models may need to be adjusted along the way.
Steve was an SRE at Google for about 10 years, then left to help a company move to the Cloud. He's back at Google, helping more companies do that.