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GuideIT

Senior System Administrator

GuideIT

. Administer, maintain, and support server and cloud infrastructure as directed by the client’s designated lead .

Posted 10/29/2026full-timeUnited StatesSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive expertise in Windows Server administration, AWS infrastructure management, and Microsoft 365 administration, alongside strong capabilities in system maintenance, automation, and security compliance. Proven ability to mentor junior staff and contribute to documentation and operational standards.

Highest-signal resume keywords
Windows Server AdministrationAWS Infrastructure ManagementMicrosoft 365 AdministrationPowerShell ScriptingITIL Standards Compliance

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Active DirectoryGroup PolicyDNSDHCPEC2S3VPCIAMRoutingSwitching
Soft Skills
MentoringCollaborationTechnical Support
Tools & Technologies
AzureVMware vSphereHyper-VMonitoring ToolsTicketing Systems
Certifications & Qualifications
Microsoft CertificationsAWS CertificationsITIL Training
Industry Keywords
Disaster RecoveryInfrastructure-as-CodeConfiguration ManagementCloud SecurityCompliance Standards

Tech Stack

Tools & technologies
AWSAzureCloudDNSEC2FirewallsLinuxSMTPSwitchingTCP/IPVMware

About the role

Key responsibilities & impact
  • Administer, maintain, and support server and cloud infrastructure as directed by the client’s designated lead
  • Build out systems, provide documentation and support, and deploy new environments and sites
  • Deploy, configure, and maintain Windows Server, Active Directory, DNS, DHCP, Group Policy, file and print services, AWS, Azure, Microsoft 365, VPNs, load balancers, and firewall policies
  • Perform system maintenance and upgrades, including service packs, patches, hot fixes, and security baselines
  • Monitor system, platform, and network performance for availability and reliability
  • Conduct resource monitoring, trending, capacity planning, and cloud cost and consumption reviews
  • Administer backup, replication, and disaster recovery processes and participate in restore testing
  • Automate administrative tasks using PowerShell, Bash, or comparable scripting and infrastructure-as-code tooling
  • Follow configuration and change management policies
  • Collaborate with the security team on identity, endpoint, and cloud security controls
  • Provide escalation-level technical support within strict SLA windows
  • Mentor junior administrators and support staff
  • Contribute to runbooks, standards, and knowledge base documentation

Requirements

What you’ll need
  • 5+ years of hands-on systems administration experience in enterprise or managed services environments
  • Expertise in Windows Server administration, including Active Directory, Group Policy, DNS, DHCP, certificate services, and MFA
  • Hands-on experience administering AWS infrastructure, including EC2, S3, VPC, IAM, Route 53, and CloudWatch
  • Secondary working knowledge of Microsoft Azure
  • Proficiency administering Microsoft 365, including Exchange Online, SharePoint Online, OneDrive, Teams, Intune, and Entra ID
  • Working knowledge of routers, switches, and firewalls, including Cisco, Meraki, and Palo Alto
  • Understanding of routing, switching, VPN technologies, TCP/IP, DNS, DHCP, SMTP, IMAP, POP3, and other communication protocols
  • Experience with PowerShell or other scripting tools
  • Experience with VMware vSphere or Hyper-V
  • Strong familiarity with ITIL standards and compliance in regulated environments
  • Knowledge of ticketing systems and ability to resolve tickets promptly
  • Availability for on-call rotation and scheduled after-hours maintenance
  • Authorized to work in the US
  • Bachelor's degree or an equivalent combination of education and relevant experience required
  • Occasional travel to customer locations as needed
  • Desired: Microsoft or AWS certifications, ITIL training or experience, monitoring and observability tools, patch management, Linux administration, infrastructure-as-code and configuration management, and backup/disaster recovery platforms

Benefits

Comp & perks
  • Performance-based bonuses
  • 401K
  • Health insurance coverage
  • Dental insurance coverage
  • Vision insurance coverage
  • Paid holidays
  • Paid time off
  • Career development and growth opportunities
  • Regular feedback and career coaching
  • Mentoring
  • Flexible work-life balance
  • Annual Values Awards