IT Engineer - Microsoft Enterprise Systems Administrator Advisor, TS/SCI with Polygraph

General Dynamics Information Technology (GDIT) is seeking a highly skilled IT Engineer with strong experience in both Microsoft Enterprise Systems and Linux administration to provide Tier II support for a large Federal Intelligence Agency. This role is part of a high-performing team that supports mission-critical infrastructure across multiple security enclaves and hybrid environments (Windows and RHEL).

As a Tier 2 engineer, you will be responsible for advanced troubleshooting, user support, and system optimization for both Windows and Linux platforms, helping ensure consistent system performance and operational reliability.

Key Responsibilities:

• Provide Tier II support for incident resolution and user issues in a mixed Windows/Linux enterprise environment.

• Administer and support Windows workstations and servers (Windows 10, Server 2012/2016), including Active Directory, Group Policy, DNS, DHCP, and DFS.

• Perform Linux system administration (RHEL, CentOS, Ubuntu), including user management, permissions, and basic performance diagnostics.

• Troubleshoot application crashes, system performance issues, and connectivity problems.

• Deliver remote and on-site end-user desktop support, resolving escalated technical issues effectively and efficiently.

• Respond to service desk escalations using tools like ServiceNow or NETS; provide documentation and incident reporting.

• Collaborate with external teams to analyze and improve end-user experience.

• Participate in incident triage and real-time response efforts.

• Engage in special projects and contribute to long-term solutions for recurring system issues.

• Maintain compliance with DoD security standards, including DoD 8570 IA certification requirements.

Basic Qualifications:

• Bachelor’s degree in Computer Science, Information Systems, or related field (or equivalent work/military experience).

• Minimum 8+ years of experience in systems administration, with demonstrated Tier 2 support capabilities.

• Active TS/SCI with Polygraph clearance.

• Current DoD 8570 IAT Level II Certification (e.g., CompTIA Security+ CE, SSCP, or CCNA-Security). Security+ CE preferred.

• Must obtain the appropriate Computing Environment (CE) training within six (6) months of hire.

Required Technical Skills & Knowledge:

• Windows operating systems (Windows 10, Server 2012/2016)

• Linux administration (RHEL/CentOS/Ubuntu)

• Active Directory, DNS, DHCP, DFS, LDAP

• Troubleshooting Microsoft Office applications (Outlook, Excel, Word), Java, and web browsers

• Familiarity with ITSM tools such as ServiceNow

• Strong verbal and written communication skills

• Understanding of ITIL v3 or higher

Preferred/Bonus Skills:

• Microsoft SCCM

• PowerShell scripting

• VMware and Citrix virtualization

• VMware User Experience Management (UEM)

• Microsoft Exchange administration

• Video conferencing and VoIP support

• Networking fundamentals

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