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System Administrator III

RadiantHire Solutions Inc.
Arlington, VA Full Time
POSTED ON 11/23/2025
AVAILABLE BEFORE 12/19/2025

Title: Lab Manager III

Description: 
Our client is supporting their prime contractor and their U.S. Government customer to provide support for onsite incident response to civilian Government agencies and critical asset owners who experience cyber-attacks, providing immediate investigation and resolution.  
 
They are seeking a Lab Manager III to support this critical mission by performing investigations to characterize the severity of breaches, developing mitigation plans, and assisting with the restoration of services.

Eligibility: 

  • Must be a US Citizen 

  • Must have an active Secret clearance, TS/SCI is preferred

  • Must be able to obtain DHS Suitability prior to starting employment  

  • 5 years of directly relevant experience in system administration

Responsibilities Include: 

  • Applying advanced analytical skills and technical resources at the tactical levels and implementing infrastructure solutions supporting command decision making and execution of mission requirements

  • Support the implementation of new technologies and equipment in the lab environment

  • Assesses network topology and device configurations identifying critical security concerns and providing security best practice recommendations

  • Advises and provides insight on development of lab standard operating procedures (SOPs) and policies

  • Provide support for Virtual Private Network (VPN) or Virtual Desktop Infrastructure (e.g., Citrix) to users

  • Provide support for MacOS and iOS to users

  • Provide troubleshooting and triaging assistance for basic to intermediate technical challenges and user issues

  • Monitor and respond to users on IT helpdesk channels and phone lines

  • Assist in the management of user accounts and resetting credentials

  • Performing implementation of granular access control, and monitor systems for acceptable performance and user accessibility, establish back-ups, and monitor systems security

  • Troubleshoot and resolve complex storage problems across the enterprise related to storage and replication strategies across local and wide area networks

  • Monitor channels for storage-related network and system issues and remediate them as they occur

Required Skills: 

  • Experience with multiple operating systems, to include Linux/Unix & MacOS

  • Experience and knowledge of networking and network administration

  • Experience with Virtual Private Networks (VPN)

  • Experience with virtual desktops (Citrix, VMWare)

  • Must be able to work collaboratively across physical locations

Desired Skills:  

  • Experience working with SIEMs to include ELK and Splunk

  • Virtualization automation and optimization

  • Experience working with Jamf Pro, DEP, and Enterprise Connect implementation

  • Experience with writing technical procedures and standard operating procedures

Desired Certifications: CEH, Sec , Network , CCNA
Required Education: BS Computer Science, Computer Engineering, Computer Information Systems, Computer Systems Engineering or related degree; or HS Diploma and 7 years lab management or systems administration experience

Salary.com Estimation for System Administrator III in Arlington, VA
$107,701 to $134,135
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