About the System Administrator role
A System Administrator keeps an organization's IT infrastructure running. They install and maintain servers and operating systems, manage user accounts and permissions, apply patches and updates, and make sure backups actually restore when they are needed. When systems go down, they are the ones who bring them back.
The role covers a wide surface. A strong sysadmin handles Windows or Linux servers, Active Directory or similar identity systems, networking basics, and endpoint management, while automating routine work with scripts instead of repeating it by hand. In many companies, sysadmins also administer cloud resources, SaaS tools, and virtualization platforms, and serve as escalation point for tricky IT support issues.
In your posting, describe your environment concretely: operating systems, on-premises versus cloud, number of users and servers, and whether the role includes help desk duties or on-call rotations. Sysadmin roles vary enormously between companies, and specificity attracts candidates who fit yours.
System Administrator job description template
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Job brief
We need a System Administrator to keep our infrastructure reliable, secure, and understood by more than one person. You will run our servers and core services, manage accounts and access, keep patching and backups on schedule, and be the person who brings systems back when something breaks.
You will do well here if you script the fix rather than repeat it, document what you build, and stay patient with colleagues whose technical level varies widely. The measure of the job is how rarely anybody has to think about it.
Responsibilities
- Install, configure, and maintain servers, operating systems, and core services
- Manage user accounts, groups, and access permissions through Active Directory or an equivalent identity system
- Apply patches and updates on a regular schedule and remediate security vulnerabilities
- Maintain and test backup and recovery procedures so data can actually be restored
- Monitor system performance and availability, and respond to alerts and outages
- Administer networks, including DNS, DHCP, VPNs, and firewalls
- Manage endpoints, printers, and peripherals, and support employee onboarding and offboarding
- Automate repetitive administrative tasks with scripts instead of repeating them by hand
- Document systems, configurations, and procedures, and keep the IT asset inventory current
- Act as the escalation point for infrastructure issues the support team cannot resolve
Requirements and skills
- Several years administering infrastructure as a system administrator or in a similar role
- Strong with Windows Server, Linux, or both, depending on the environment you are joining
- Hands-on with Active Directory, Group Policy, or an equivalent identity and access system
- Comfortable with networking fundamentals: TCP/IP, DNS, DHCP, and VPNs
- Has run a virtualization platform such as VMware, Hyper-V, or Proxmox
- Scripts in PowerShell or Bash well enough to automate the repetitive work
- Has owned backups and disaster recovery, including the restore tests nobody enjoys
- Troubleshoots methodically and explains the outcome to colleagues without jargon
Nice to have
- Experience administering cloud services such as AWS, Azure, or Microsoft 365
- Certifications such as CompTIA Server+, RHCSA, or Microsoft administrator certifications
- Experience with endpoint management tools such as Intune or Jamf
- Familiarity with monitoring tools such as Zabbix, Nagios, or PRTG
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