Site Reliability Engineering (SRE) combines software and systems engineering to build and run large-scale, massively distributed, fault-tolerant systems. SRE ensures that Google Cloud's services have reliability, uptime appropriate to customer's needs and a fast rate of improvement. The focus is on optimizing existing systems, building infrastructure, and eliminating work through automation. The team manages the complex challenges of scale unique to Google Cloud while using expertise in coding, algorithms, complexity analysis, and large-scale system design. SRE's culture includes intellectual curiosity, problem-solving, and openness, encouraging collaboration, big thinking, and risk-taking in a blame-free environment.