Systems Administrator – Core Services, Microsoft

SHR Consulting Group

Core Services Systems Administrator managing Microsoft infrastructure, ensuring operational stability across 21 AD domains and supporting various services. Join SHR Consulting Group addressing modernization and readiness challenges.

Posted 5/9/2026full-timeArlington • Virginia • 🇺🇸 United StatesMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

DNSLinuxSMTPVMware

About the role

Key responsibilities & impact

Operate and maintain Active Directory, DNS, DHCP, and Distributed File System (DFS) infrastructure across approximately 21 AD domains; manage Active Directory Security Groups, Group Managed Service Accounts ( gMSA ), Organizational Units, and Group Policy Objects in accordance with Microsoft Security Administrative Environment guidance.
Administer the JSP Microsoft Exchange Server environment supporting approximately 5,000 mailboxes on JWICS, including monitoring, mailbox provisioning, system upgrades, backup/restore, and patching.
Operate and maintain enterprise SMTP gateways (currently Symantec Messaging Gateways) on NIPR and SIPR networks; maintain SMTP routing tables, MX/SPF/DKIM records, and the SMTP Outbound Client list in compliance with security policy.
Operate and maintain the JSP enterprise Print Services environment: manage print servers, print drivers, print queues, and scaling for customer demand; coordinate with JP5/JP7 during major upgrades and lifecycle refresh.
Operate and maintain the System Center Operations Manager (SCOM) deployment on NIPR, SIPR, and JWICS, including management servers, gateway servers, and Linux SSH/SSL monitoring; ensure systems are maintained with the latest Management Packs and that alerts function correctly.
Identify, analyze, and resolve problems affecting system operations across all assigned core services; meet Group 1 restoral AQLs (CCIR Priority 1 – 2 hours; Priority 2 – 4 hours; Priority 3 – 6 hours) more than 90% of the time.
Schedule and perform routine backups; test and validate backup procedures at least annually; store backups away from the proximity of the physical system.
Apply security patches, GPO changes, and configuration updates to maintain compliance with DoD STIGs, IAVM notices, and other cyber tasking; collaborate with cyber teams on compliance scanning and endpoint analysis.
Maintain DoD/NSS PKI server certificates and ensure they are issued/renewed within 30–15 days before expiration; maintain a tracker of expiration dates.
Coordinate with the JSP Transport, Networks, and JP5/JP7 teams during major system upgrades, firewall changes, and hardware lifecycle refresh activities.

Requirements

What you’ll need

Five (5) or more years of hands-on experience administering Microsoft Windows Server in a large enterprise environment (3+ years for the System Administrator variant)
Strong experience with at least two of the following Core Services areas: Active Directory/DNS/DHCP/DFS, Microsoft Exchange Server, SMTP gateways/messaging security, Microsoft Print Services, or Microsoft System Center Operations Manager (SCOM)
Working knowledge of CAC/PKI, DoD-issued SSL certificates, Group Policy, and complex multi-domain/multi-forest AD environments
Experience implementing DISA STIGs and supporting IAVM remediation against Windows Server platforms
Familiarity with virtualization (VMware vSphere/ESXi), backup and restore tooling, and enterprise monitoring tools
PowerShell scripting experience strongly preferred for automation of routine administrative tasks.
For the Senior variant, demonstrated experience leading subject-matter design and complex troubleshooting across geographically dispersed, load-balanced, clustered server architectures is required.
Strong troubleshooting, documentation, and customer-service skills; ability to support after-hours and on-call rotations.

Benefits

Comp & perks

Comprehensive benefits package including health, dental, vision, and retirement plans
Paid time off and holidays

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Active DirectoryDNSDHCPDistributed File System (DFS)Microsoft Exchange ServerSMTP gatewaysMicrosoft Print ServicesSystem Center Operations Manager (SCOM)PowerShell scriptingDISA STIGs

Soft Skills

troubleshootingdocumentationcustomer-serviceleadershipcollaboration

Certifications

DoD-issued SSL certificatesCAC/PKI