Tier II Help Desk/Junior System Administrator- Full Scope Polygraph

Cyber Defense Technologies
Chantilly, Fairfax County, VA
Overview: CDT is seeking a highly organized and technically skilled Tier 2System Administrator to provide advanced technical support, systems maintenance, and troubleshooting in a dynamic and security sensitive environment. This position will be onsite in Chantilly, VA.

Clearance Requirements: An active TS/SCI with Full Scope Polygraph is required. Candidates who do not meet these clearance requirements will not be considered.

Responsibilities:
  • Provide Tier 2 support for escalated technical issues related to Windows, Linux, and/or Mac systems.
  • Perform system diagnostics, maintenance, patching, and updates to ensure optimal performance and security compliance.
  • Monitor system performance and availability using established tools and dashboards.
  • Administer Active Directory, DNS, DHCP, and other network and directory services.
  • Maintain system documentation, configuration management records, and SOPs.
  • Collaborate with Tier 1, Tier 3, and engineering teams to resolve complex issues.
  • Ensure compliance with security protocols, data protection standards, and change management procedures.
  • Assist with onboarding/offboarding users and managing access permissions.
  • Support incident response and root cause analysis for system outages or breaches.
Qualifications:
  • Bachelor’s degree in Computer Science, Information Technology, or related field (or equivalent experience)
  • Strong understanding of networking principles with experience setting up and troubleshooting 3+ years of experience in a system administration role, preferably in a cleared environment.
  • Strong working knowledge of Microsoft Windows Server and/or Linux systems.
  • Experience with Active Directory, Group Policy, SCCM, or similar tools.
  • Familiarity with virtualization platforms (VMware, Hyper-V, etc.).
  • Understanding of networking principles (TCP/IP, DNS, DHCP, VPN, firewalls).
  • Ability to troubleshoot hardware, software, and connectivity issues.
  • Strong documentation and communication skills.
Preferred Qualifications:
  • CompTIA Security+, CEH, or other DoD 8570-compliant certifications.
  • Experience supporting classified systems or working within a secure facility.
  • Familiarity with ITIL framework or ticketing systems like ServiceNow or Jira.
  • Experience with scripting or automation (PowerShell, Bash, etc.).
Why Join Cyber Defense Technologies?
At CDT, we offer a collaborative and inclusive work environment where your expertise in System Administration can help shape the future of cybersecurity and engineering solutions. You’ll have the autonomy to shape the lab infrastructure while supporting critical engineering workflows in a collaborative, mission-driven environment.

Compensation and Benefits:
  • Competitive salary based on experience.
  • Comprehensive benefits package, including health, dental, and retirement plans.
  • Opportunities for professional development and career advancement.
Apply Now:
If you are a proactive Tier 2 System Administrator and thrive in dynamic environments, we encourage you to apply and join the CDT team!

CDT is committed to hiring and retaining a diverse workforce. We are an Equal Opportunity employer making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class.

Posted 2025-08-19

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