They make shipping software faster, easier, and safer. Frameworks such as Terraform and kubernetes both allow you to bring up servers and what not with a short hand language that removes a lot of the complexity of the underlying stack.
Site reliability engineer makes sure app/website stays up. Otherwise, an engineer getting a call in the middle of the night because something is broken is more common. Basically, they do work up front to prevent the middle of the night scenario, as well as reduce customers having issues (support tickets).
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