Senior Systems Administrator: Windows, AD & Security (TS/SCI)

Leidos; Suitland (MD); On-site; USD 92,000 - 167,000; Full time

Job summary

Leidos is seeking an experienced Systems Administrator for the Office of Naval Intelligence (ONI) in Suitland, MD. The role focuses on Windows/macOS environments, IT and cybersecurity support, and system reliability for national security missions.

You will work with advanced workstations, engineering analysis tools, and security accreditation activities while maintaining documentation and SOPs. Onsite work during core hours is required.

Qualifications

• Active TS/SCI clearance in DISS and required program access.
• Bachelor's degree with 8+ years of experience or Master's with 6+ years; additional training acceptable in lieu of degree.
• Active DoD 8140 IAT Level II certification (or ability to obtain within 30 days).
• 5+ years of Windows Systems Administration experience, including Windows 11 upgrades.
• Experience with Active Directory administration, SCCM deployments, SQL Server troubleshooting, Group Policy management, and STIG updates.
• Experience with IT infrastructure installation, evaluation, maintenance, and Microsoft Azure Cloud Administration.
• Knowledge of C&A, DIACAP, RMF, ICD-503, and/or NIST Framework requirements.
• Experience maintaining technical documentation and weekly reports; SOPs creation.
• Strong troubleshooting and communication skills; ability to coordinate with technical teams.

Responsibilities

• Troubleshoot and resolve Windows-based issues within established timelines.
• Support Windows 11 upgrades, system maintenance, software updates, and hardware replacements.
• Perform Active Directory administration, including account creation and troubleshooting.
• Support SCCM deployments, SQL Server troubleshooting, and Group Policy updates.
• Implement and maintain STIG configurations and updates.
• Track changes and tickets using ServiceNow or Remedy AR.
• Maintain configuration management records and SOPs; prepare weekly reports.
• Support RMF activities and compliance with DoD/IC policies.
• Collaborate with teams to support IT infrastructure, applications, and services.

Skills

Windows Systems Administration

Active Directory

SCCM deployments

SQL Server

Group Policy

STIG implementation

RMF

Azure Cloud Administration

Networking components

IT infrastructure

Education

Bachelor's degree with 8+ years experience

Master's degree with 6+ years experience

Tools

ServiceNow

Remedy AR

Job description

Leidos is seeking an experienced Systems Administrator for the Office of Naval Intelligence (ONI) in Suitland, MD. The role focuses on Windows/macOS environments, IT and cybersecurity support, and system reliability for national security missions.

You will work with advanced workstations, engineering analysis tools, and security accreditation activities while maintaining documentation and SOPs. Onsite work during core hours is required.