System Administrator

Obsidian Solutions Group is seeking a System Administrator to provide technical support, system maintenance, cybersecurity compliance, and network management for military information systems and mission command platforms. The ideal candidate possesses foundational DoD-aligned certifications, hands-on experience with Microsoft Server and VMware environments, and proficiency with key Army/Joint mission command systems and security tools., * Administer and maintain Windows Server environments, virtual machines, and VMware vCenter infrastructures.

• Implement system and network hardening techniques to ensure compliance with DoD cybersecurity standards.
• Manage Microsoft SharePoint sites, permissions, workflows, and content structure.
• Support configuration, maintenance, and troubleshooting of Joint/Army Mission Command systems (e.g., TAK, CPCE, SOF MC).
• Use diagnostic tools to identify, troubleshoot, and resolve system/server issues.
• Configure and maintain network protocols including TCP/IP, DHCP, and DNS.
• Monitor system performance and optimize servers, services, and virtual environments.
• Support vulnerability management activities using ACAS/Nessus and remediate findings.
• Maintain and operate DoD security tools such as AESS, Trellix, Microsoft Defender Endpoint, and other mandated platforms.
• Implement file system configurations including NTFS, FAT, and EXT standards.
• Ensure proper configuration and security of firewalls, DMZs, encryption technologies, and other IT security controls.
• Manage user accounts, permissions, and group policies within enterprise environments.
• Maintain accurate documentation, system diagrams, configuration baselines, and incident reports.
• Provide technical support to users, troubleshoot issues, and escalate complex problems when necessary.
• Support continuity of operations through regular system backups, recovery planning, and redundancy management.

• Security Clearance: Active Secret clearance required
• Associate degree in an Information Technology (IT) related field OR equivalent military training, * Current certification meeting DCWF System Administrator (451) Basic proficiency requirements (Security+ CE or CySA+)
• System administration and OS/network hardening
• File system implementations (NTFS, FAT, EXT)
• IT security principles (firewalls, DMZs, encryption)
• Network protocols (TCP/IP, DHCP, DNS)
• Operating system command line operation
• Diagnostic tools and fault identification
• Virtualization technologies and VM management
• System performance monitoring and optimization

Minimal Background/Experience Required:

• In-depth knowledge of Microsoft Server environments
• Experience with VMware (vCenter) and SharePoint administration
• Experience with Joint/Army Mission Command systems (TAK, CPCE, SOF MC)
• Experience using ACAS, AESS, Trellix, Microsoft Defender Endpoint, and other DoD security tools

A career at Obsidian Solutions Group means you can put your expertise, credentials, and talents to great use working with customers in the DOD and Intelligence Community, while enjoying the excitement of working in a fast-growing organization committed to making a difference for our customers and in our community. Contribute independently and collaboratively alongside our amazing team of doers and thinkers. Obsidian Solutions Group is small enough to offer a family atmosphere yet large enough to deliver a highly competitive compensation package. We hire and retain the best in the industry, offering exceptional benefits that protect the well-being of our employees, their spouses and domestic partners, and their families.

Our corporate philosophy is centered on hiring and retaining employees with the requisite skills, professional experience, personal commitment, and ethical standards necessary to foster a culture of operational excellence necessary to surpass our customer’s expectations.

Obsidian Solutions Group LLC (OSG) is a fast-growing professional services firm based in Fredericksburg, VA. We create value for our customers by delivering technology-enabled & mission-oriented technical solutions that solve complex problems, protecting people, information, and assets. Our core capabilities are in providing Enterprise IT, Intelligence Analysis, Production & Development and Knowledge-Based Professional Services Solutions that enable the customer’s mission. Obsidian Solutions Group LLC is a veteran-owned small business.