Security-Cleared Systems Engineer, SME (Windows/Linux)

RealmOne; Chantilly (VA); On-site; USD 140,000 - 200,000; Full time

Job summary

RealmOne is seeking a Systems Engineer - SME to support mission‑critical enterprise infrastructure and security operations for a key U.S. Government customer in Chantilly, VA.

The role requires deep experience across Windows and Linux environments, virtualization, PKI, and A&A activities, with a focus on secure, highly available systems. You will design, implement, and maintain enterprise environments, administer AD, MSSQL, Hyper‑V, and PKI, and lead automation with PowerShell while

Qualifications

• Minimum 16 years of Systems Engineering experience supporting enterprise Windows and Linux environments.
• Demonstrated experience supporting Assessment & Authorization (A&A) activities for security‑controlled systems.
• Demonstrated experience with Windows systems engineering and administration, Active Directory Certificate Services (ADCS), VM clusters, Hyper‑V, Data Protection Manager, and PowerShell scripting.
• Position requires active Security Clearance with appropriate Polygraph.

Responsibilities

• Design, implement, administer, and maintain enterprise Windows Server and Linux environments supporting mission‑critical systems.
• Engineer, configure, and support Microsoft Windows Server operating systems including Server 2016, 2019, and 2022.
• Administer Active Directory, GPOs, ADCS, and enterprise identity services.
• Install, configure, administer, and troubleshoot MSSQL databases supporting enterprise applications.
• Manage Hyper‑V virtualization environments and backup solutions including DPM.
• Develop and maintain PowerShell scripts to automate system administration, monitoring, reporting, and tasks.

Skills

PowerShell scripting

Windows Server

Linux

Active Directory

SQL Server

Hyper-V

PKI

RMF

A&A

Documentation

Tools

WSUS

ADCS

SQL Server

Hyper-V

PKI

Job description

RealmOne is seeking a Systems Engineer - SME to support mission‑critical enterprise infrastructure and security operations for a key U.S. Government customer in Chantilly, VA.

The role requires deep experience across Windows and Linux environments, virtualization, PKI, and A&A activities, with a focus on secure, highly available systems. You will design, implement, and maintain enterprise environments, administer AD, MSSQL, Hyper‑V, and PKI, and lead automation with PowerShell while