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The role of a Site Reliability Engineer (SRE) primarily revolves around maintaining the reliability and performance of production systems. SREs bridge the gap between traditional software development and operations by applying software engineering principles to system administration topics. This involves automating processes, ensuring system reliability, availability, and performance, as well as managing capacity and scaling systems efficiently.

SREs are responsible for monitoring system performance, responding to incidents, and implementing solutions that enhance system resilience. Their work is critical for minimizing downtime and ensuring that systems operate smoothly, which directly contributes to a better user experience and business continuity.

While developing new software features, handling customer support issues, and performing manual testing are important functions within a tech organization, they do not directly align with the key responsibilities of an SRE, which are centered around system reliability and performance management.