Thomas.

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    Analyzing system logs and identifying potential issues with computer systems.
    Introducing and integrating new technologies into existing data center environments.
    Performing routine audits of systems and software.
    Performing backups.
    Applying operating system updates, patches, and configuration changes.
    Installing and configuring new hardware and software.
    Adding, removing, or updating user account information, resetting passwords,etc.
    Answering technical queries and assisting users.
    Responsibility for security.
    Responsibility for documenting the configuration of the system.
    Troubleshooting any reported problems.
    System performance tuning.
    Ensuring that the network infrastructure is up and running.

Among other duties