Senior LevelSystem Administrator Resume Example

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System Administrator Resume Template (senior level)

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Professional Summary

Senior System Administrator with 11 years designing and running Windows, Linux, and hybrid-cloud infrastructure. Leads migrations and DR strategy, sets automation and security standards, and mentors junior admins.

Professional Experience

Senior System AdministratorMar 2019 - Present

Summit Health Systems, Minneapolis, MN

Led a 600-mailbox migration from on-prem Exchange to Microsoft 365 with zero unplanned downtime.
Owned the DR plan for critical systems, running annual failover tests meeting a 4-hour RTO and 1-hour RPO.
Mentored two junior admins on PowerShell and AD, building runbooks that reduced their escalations by 40%.

System AdministratorJun 2015 - Feb 2019

Northwind Logistics, St. Paul, MN

Migrated 20 on-prem workloads to Azure IaaS with backup and cost tagging that cut monthly spend by 18%.
Designed and consolidated 60 Group Policy Objects into a standardized baseline, reducing login times 25%.
Hardened servers to CIS benchmarks and remediated critical vulnerabilities within a 14-day SLA.

IT Systems AdministratorJul 2013 - May 2015

Cedar Point Retail, Duluth, MN

Administered 25 RHEL and Ubuntu servers, writing Bash and systemd automation for logging and monitoring.
Deployed Zabbix monitoring across 600 endpoints, cutting mean time to detection to under 5 minutes.
Served in a 24/7 on-call rotation, resolving P1 incidents within a 30-minute response SLA.

Skills

Infrastructure Architecture, Migrations, Disaster Recovery, Automation Standards, Security Hardening, Cloud (Azure), Team Mentoring, Virtualization

Education

B.S. Computer Information SystemsMay 2013

University of Minnesota

Certifications

Microsoft Certified: Azure Administrator Associate (AZ-104)
VMware Certified Professional (VCP-DCV)
Red Hat Certified System Administrator (RHCSA)
CompTIA Security+

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Key Skills for System Administrator

Infrastructure ArchitectureMigrationsDisaster RecoveryAutomation StandardsSecurity HardeningCloud (Azure)Team MentoringVirtualization

ATS Keywords for System Administrator

Use these naturally in your summary, skills, and experience when they reflect your background.

System AdministratorInfrastructure DesignVMwareActive DirectoryDisaster RecoveryAzurePowerShellMigrationsGroup PolicySecurity HardeningMentoringMicrosoft 365

How to Write a Senior Level System Administrator Resume

At the senior level, a system administrator resume must prove multiplier impact: infrastructure you designed, migrations you led, DR and security standards you own, and the junior admins you mentored, not just another list of platforms you kept running day to day.

Resume Writing Tips

Lead with architecture and migrations

Describe a system you designed or migrated, such as an Exchange-to-Microsoft 365 move or a cloud migration, and the downtime, cost, or reliability outcome, showing you shape infrastructure rather than only maintain it.

Quantify DR and security ownership

State the DR plan you own with its RTO and RPO and the security standards you set, like CIS hardening or a patch cadence, demonstrating you are accountable for reliability and compliance across the environment.

Show your mentoring footprint

Describe how many admins you mentored and the outcome, such as runbooks that cut their escalations, proving you raise the whole team's capability, not only your own output.

Skills to Highlight

Infrastructure Architecture

Detail a design or consolidation decision you led, such as GPO baselines or server consolidation, and the performance or cost outcome, showing judgment beyond routine administration.

Migrations

Describe a migration you owned end to end, its scope in mailboxes or workloads, and the downtime or cost result, proving you can execute high-risk change safely.

Disaster Recovery

Cite the DR plan you own, the RTO and RPO you meet, and your testing cadence, since recovery ownership is a core senior differentiator.

Automation Standards

Explain automation or runbook standards you set across the team and the toil or escalation reduction that followed adoption, showing org-level impact.

Common Questions

How do I prove seniority without an architect or lead title?

Describe scope directly: infrastructure you designed, migrations you led, DR and security standards you own, and admins you mentored. Owning architecture and driving standards demonstrates influence that managers value regardless of whether your title says 'senior' or 'lead.'

Should I still show hands-on work at this level?

Yes, balance it. Show you still administer and automate systems by naming recent technical work, then layer on design, migrations, DR ownership, and mentoring, since senior roles expect both continued technical depth and environment-wide leadership.

How do I keep a long IT resume focused?

Senior Security Analyst resume. Focus on security architecture, policy development, and advanced threat hunting.

Security ArchitectureGovernance, Risk & Compliance (GRC)Advanced Threat Hunting

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