System Security Administrator - Sr Principal (w/ active TS)
Company: Critical Solutions
Location: Arlington
Posted on: February 16, 2026
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Job Description:
Job Description Job Description System Security Administrator -
Sr Principal (w/ active TS) Location: Arlington, VA Clearance:
TS/SCI Schedule: TBD Full-time JOB DESCRIPTION Critical Solutions
is seeking an experienced Systems Security Administrator to support
our federal customer in Arlington, VA. PRIMARY ROLES AND
RESPONSIBILITIES: Perform domain migrations, both internal and
external to the customer environment, to include Active Directory,
file services, print services, DHCP, and other commodity IT
services. Resolve a wide range of system issues including
troubleshooting software and hardware, diagnosis of network issues,
and addressing trouble tickets and service tasks across all tiered
levels. Assist with achieving optimum performance and availability
standards through implementing appropriate technical solutions.
Complete the day-to-day tasks associated with system administration
in the DES Compute Environment. Provide support for implementation,
troubleshooting, and maintenance of IT systems. Provide on call
24/7 support to the current operations team when
troubleshooting/resolving incidents with enterprise systems.
Provide escalation support to the NOC/monitoring team when
troubleshooting issues with enterprise systems. Manage IT system
infrastructure and continuously update associated process and/or
procedural documentation. Work within the DevSecOps methodology to
plan and support implementation of new technologies. Prepare
recommendations for resolutions to NetOps challenges based on
monitoring results, tools analysis, and/or forensics. Work with
other service teams to resolve enterprise incidents as part of the
DES Operations Problem Solving Team. Work with the monitoring team
to address issues that will impact system availability. Update
systems by implementing and maintaining security controls. BASIC
QUALIFICATIONS: Must possess an active Top-Secret Clearance w/ SCI
eligibility. Bachelor's degree in Computer Science, Information
Technology, or related field and 12 years of relevant experience
UNIX, Windows, and/or Storage administration experience. Experience
with trouble reporting and tracking systems such as BMC REMEDY and
ServiceNow. Ability to lift/move/carry equipment when necessary
(max forty pounds). Experience in managing, troubleshooting, and
maintaining Windows Servers. Strong experience managing Windows
Active Directory, virtual servers, VMware, and Azure including
support of AD migration of accounts and objects. Experience with
vulnerability scanning solutions. Familiarity with the DOD
Information Assurance Vulnerability Management program. Familiarity
with MECM, AZURE, Ansible, Antivirus and security deployment tools.
Experience with on-call rotation schedule for incident respond and
escalations. DOD 8570 IAT II Certification (Sec CE or equivalent).
Expertise in troubleshooting Windows Operating Systems (Windows
10/11 and Server 2019), Microsoft Office 365, Active Directory,
network issues, print logic, IIS, VMware, and Azure. Strong
scripting and PowerShell skills. Experience building, configuring,
and hardening Windows servers. Strong VMware experience. Experience
using ServiceNow (or similar tool) to document incidents and
service requests. Advanced experience with Active Directory
management and administration. ADDITIONAL INFORMATION: This
position is contingent on contract award. Clearance Requirement:
Possess an active DoD Top Secret Clearance . In addition, selected
candidate must undergo background investigation (BI) and finger
printing by the federal agency and successfully pass the preceding
to qualify for the position. US CITIZENSHIP IS REQUIRED. CRITICAL
SOLUTIONS PAY AND BENEFITS : Salary range $- $. The salary range
for this position represent the typical salary range for this job
level and this does not guarantee a specific salary. Compensation
is based upon multiple factors such as responsibilities of the job,
education, experience, knowledge, skills, certifications, and other
requirements. BENEFIT SNAPSHOT: 100% premium coverage for Medical,
Dental, Vision, and Life Insurance, Supplemental Insurance, 401K
matching, Flexible Time Off (PTO/Holidays), Higher
Education/Training Reimbursement, and more. Job Posted by
ApplicantPro
Keywords: Critical Solutions, Charlottesville , System Security Administrator - Sr Principal (w/ active TS), IT / Software / Systems , Arlington, Virginia
