Code are released on staging environments for QA.
Technical Support Team.
OS, Security, Users and Applications are fully managed.
Restrict access to the server. Only required ports are allowed to be accessed.
The overall chain of processes that automatically gets source code changes and runs them through build, test and packaging to produce a deployable release, largely without any human intervention.
Never buy hardware again, highly secure, lower your overall cost and fully managed 24/7.