System Administrator Resume Keywords for ATS (2026)
Applying for System Administrator roles? The applicant tracking system (ATS) — and the recruiter searching it — look for specific skills and tools. Here are the keywords that matter most for a System Administrator, plus how to use them honestly. (An ATS mostly stores and ranks applications for recruiters to search; it rarely auto-rejects on keywords alone, so stuffing backfires.)
Top System Administrator resume keywords
How to use each keyword group
Platforms and identity
Windows Server Linux Active Directory Group Policy DNS/DHCP
Example bullet: Administered 60 Windows Server and Linux hosts, a two-domain Active Directory forest, and DNS/DHCP for three sites; consolidated 140 inherited Group Policy objects into 22 documented ones.
Virtualization and cloud services
VMware Hyper-V Virtualization Office 365
Example bullet: Led virtualization of 38 physical servers onto a six-host VMware cluster and a Hyper-V branch site, then migrated 600 mailboxes to Office 365 with no data loss.
Automation and operations
PowerShell Shell Scripting Patch Management Backup & Recovery
Example bullet: Automated onboarding with PowerShell and Linux shell scripting, ran monthly patch management rings to 98 percent compliance, and rebuilt backup & recovery with quarterly restore tests.
Reliability
Monitoring Troubleshooting
Example bullet: Built Zabbix monitoring for 200 hosts and services from scratch, cutting mean time to detect outages from hours to minutes and shortening troubleshooting on recurring issues with runbooks.
Sample professional summary
System administrator with eight years supporting mixed Windows Server and Linux environments for 600-plus users. Owns Active Directory, backups, and patch management end to end, and automates repeat work in PowerShell before it becomes a ticket queue.
Adapt it to your real background — the point is the shape, not the sentences.
Certifications worth listing
- CompTIA Server+
- Microsoft Certified: Windows Server Hybrid Administrator Associate
- Red Hat Certified System Administrator (RHCSA)
- VMware Certified Professional - Data Center Virtualization (VCP-DCV)
ATS tips for System Administrator resumes
- Write 'Active Directory (AD)' and 'Group Policy (GPO)' with both forms the first time. Postings and parsers use the abbreviation and the full name interchangeably.
- Windows Server, Active Directory, and Office 365 are table stakes for most postings. Linux, PowerShell automation, and tested backup & recovery are what move you up the list.
- Postings say 'Microsoft 365' as often as 'Office 365' now. Use whichever the posting uses, and include the other once so either search matches.
How to use these keywords
- Use only the ones genuinely true for you — woven into your experience bullets and skills section, in context.
- Mirror the exact wording in the specific job description (for example, "Windows Server").
- Keep a clean, single-column layout so the parser actually reads them.
- Never paste a keyword wall or hidden white text — modern ATS and recruiters flag it.
Check your resume against a real job
Want to see which of these you're missing for a specific posting? Paste it into the free Resume ↔ Job Match Score, or run the ATS Resume Checker. For formatting, see the ATS resume format guide and how to tailor your resume. When you're ready to apply, pair your resume with the System Administrator cover letter example.
FAQ
How many keywords should a System Administrator resume have?
Use the ones that are true for you and match the specific job description — usually 8–15 woven naturally into your experience and skills, not a long list.
Does an ATS auto-reject a System Administrator resume if keywords are missing?
No. An ATS mainly stores and ranks applications for recruiters to search; it rarely auto-rejects on keywords alone. Tailoring helps you surface in those searches.
What's the fastest way to tailor a System Administrator resume to each job?
Match the posting's wording, then let JobRizzer autofill the application and (on Pro) tailor your resume to each role — you review every field and submit yourself.