Enterprise Windows Domain and Server Administrator (Senior) with Security Clearance

General Summary COLSA is seeking to hire a Senior Windows Server System Analyst to support our Enterprise IT Support Services work at the Army Aviation and Missile Center (AvMC) at Redstone Arsenal in Huntsville Alabama. As part of the Systems Operations team, you will assist in the administration of the enterprise infrastructure, with a primary focus on Active Directory Domain Services (AD DS), Dynamic Host Configuration Protocol (DHCP), Domain Name System (DNS), and Public Key Infrastructure (PKI).

Additional responsibilities include operating system and application patch management, software license management, security compliance remediation, and providing advanced Tier 3 technical support to customers. Candidates with experience in managing Windows Internet Information Services (IIS), Microsoft SQL Server, and administrative automation through PowerShell scripting are strongly desired as well. Principal Duties and Responsibilities (*Essential functions)

• Administer, maintain, and troubleshoot Active Directory Domain Services.
• Manage user accounts, computer accounts, security groups, organizational units (OUs), implement and maintain Group Policy Objects (GPOs).
• Monitor and troubleshoot domain controllers, replication, authentication, directory synchronization, and domain trust relationships.
• Manage Active Directory sites, subnets, replication topology, and related directory services.
• Maintain enterprise DNS and DHCP services through secure configuration of forward and reverse lookup zones, dynamic update policies, and resource records. Troubleshoot DNS resolution failures, zone replication issues, record conflicts, and related network connectivity problems associated with DHCP and general TCP/IP connectivity. Monitor DNS and DHCP service availability, performance, and security, implementing corrective actions as required.
• Sustain multiple generations of Windows Server platforms on both virtual and physical servers. Sustainment will include monthly operating system updates, server software application updates, and at least quarterly server and software configuration updates in accordance with DISA STIG requirements. Develop plans and schedules to mitigate cybersecurity findings and routinely follow up on the progress of mitigation.
• Improve server administrative efficiencies through the development of new or enhancements to existing PowerShell scripts.
• Work closely with the Virtualization Infrastructure, Network Operations, SQL & IIS, Data Storage & Archival, Software Development, and Cybersecurity teams.
• Fulfill work requests and resolve issues presented to the team through our Service Desk Management tool for work prioritization and tracking to include providing Tier 3 technical support.
• Assist with supporting enterprise print and software license services.
• Develop weekly and monthly operational and engineering support status documents for management situational awareness.
• Coordinate changes with other support teams and leverage existing change management processes.
• Responsible for preparing system design specifications to meet customer requirements as well as implementing other's system design specifications. At COLSA, people are our most valuable resource and centered at our core value. We invite you to unite your talents with opportunity and be a part of our "Family of Professionals!" Learn about our employee-centric culture and benefits here: https://www.colsa.com/culture_benefits Required Experience Required Qualifications
• Bachelor's degree in Computer Science, Computer Engineering, or other related fields.
• Active Security+CE certification.
• Minimum 10 years of prior experience in a similar role involving administration of Windows Server platforms.
• Experience as a Windows Enterprise Domain Administrator on networks having virtual and physical servers, and thousands of workstations, laptops, and users.
• Experience with manual and automated methods of deploying, updating, and sustaining Windows Domain Controllers, Applications Servers, and other specialized Windows Servers.
• Experience with configuration of Windows Active Directory and Windows Servers in accordance with DISA STIG requirements.
• Experience with DoD's Evaluate-STIG and the development of STIG Checklists and associated documentation required to fulfill cybersecurity Plan of Action and Mitigation Schedules (POAMs).
• Experience developing, testing, and executing PowerShell scripts used to administer Windows Server systems.
• Proficiency with Microsoft operating system and office applications.
• Active DoD Secret clearance; US Citizenship required.

Preferred Qualifications

• Master's degree in Computer Science, Computer Engineering, or other related fields.
• Experience with Microsoft Windows Server 2025.
• Experience with Microsoft Internet Information Services (IIS) server administration and engagement with software development teams whose sites are hosted on IIS and require administrative assistance with troubleshooting and updating their sites.
• Experience with Microsoft SQL Server administration and in association as a data source for web-based applications running on IIS.
• Experience with Delinea identity security and privileged access management product suite.
• Experience with software license management systems.
• Experience with Broadcom VMware vCenter and vSphere Applicant selected will be subject to a government security investigation and must meet eligibility requirements for access to classified information. COLSA Corporation is an

Equal Opportunity Employer, Minorities/Females/Veterans/Disabled. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin.