Principal Linux System Administrator (Clearance Required)
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Before you apply
Salary$149k – $184k
LocationAurora, Colorado, United States
Typefull-time
SeniorityLead
Experience8+ yrs
DepartmentDefense, Intelligence, & Space Solutions
Company size501–1,000 people
PostedAug 3, 2026 · 3mo ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
8+ years of professional experience administering Linux systems (RHEL preferred)
Active Top Secret clearance
Experience with installation and configuration of RHEL 8 servers and workstations
Experience with system security, hardening (STIG), auditing, and backup strategies
Experience with patch and package management
Experience with virtualization technologies including VMware, Podman, Docker, Image registries, Red Hat Openshift/Kubernetes
Experience with hardware and software troubleshooting
Experience with networking in heterogeneous (Linux/Windows) environments
Strong oral and written communication skills
Detail oriented
Proven ability to work collaboratively in a team environment
Self-motivated, detail-oriented, and able to own issues through completion
Bachelor's degree in Information Technology, Network Engineering, Computer Engineering, or a related technical field
Experience with Dell servers, switches, and SAN solutions
Experience with VMware vSphere
Experience with Root Cause Analysis and documenting findings
Experience with DISA SCAP Compliance Checker and DISA STIG implementation
Experience with RHEL 8/9/10
Experience with NAS and/or SAN configuration and maintenance
Experience with configuration management, Automation, Scripting (Ansible, Bash, Python)
Experience with Git/GitLab and CI/CD pipelines
Experience with Containers and orchestration (Podman/Docker, RHOCP/Kubernetes, minikube, image registries)
Relevant certifications (Security+, RHCSA / RHCE / LPIC-1)
U.S. citizenship
Skills
RHEL
STIG
SCAP
VMware
Podman
Docker
Red Hat OpenShift
Kubernetes
Ansible
Bash
Python
Git
GitLab
CI/CD
NAS
SAN
Dell servers
VMware vSphere
DISA SCAP Compliance Checker
DISA STIG
RHEL 8/9/10
minikube
image registries
Pypi
IDEs
Benefits
Health insurance
Dental insurance
Vision insurance
Life insurance
Long term disability
Short term disability
401(k)
Profit sharing
Performance bonus
Paid parental leave
Unlimited PTO
About the company
SciTec, a Firefly Aerospace Company, is a dynamic non-traditional defense contractor that delivers advanced technologies in support of U.S. National Security and Defense. For the past forty-five plus years, we have supported Department of Defense customers by developing innovative remote sensing algorithms, tools, and techniques to deliver world-class data exploitation capabilities supporting missile defense; intelligence, surveillance, & reconnaissance; space domain awareness; and aircraft survivability missions.
Important Notice: SciTec exclusively works on U.S. government contracts that require U.S. citizenship for all employees. Applicants that do not meet this requirement will not be considered.
About the role
SciTec has an immediate opportunity for a talented engineer to support our programs delivering Next-Generation Missile Warning software. This is a unique opportunity to join a business delivering core capabilities for National defense. You will work within a fast-paced team delivering end-to-end software processing of Overhead Persistent InfraRed (OPIR) sensor data for Missile Warning, Missile Defense, Battlespace Awareness, and Technical Intelligence.
We are seeking a skilled Linux System Administrator to support the installation, configuration, security, and ongoing operation of Linux- and Windows-based systems in a secure, mission-focused environment. The ideal candidate is hands-on, detail-oriented, and comfortable working across infrastructure, security, and operations teams.
Responsibilities
•
Serve as the technical team lead for the System Administrator group, providing mentorship, guidance, and oversight to ensure consistent operational excellence
•
Install, configure, and maintain Red Hat Enterprise Linux (RHEL) workstations and servers in accordance with defined baselines
•
Implement and maintain system security, hardening, integrity monitoring, backups, and auditing i.e. STIG, SCAP
•
Perform patch and package management, including installation and maintenance of third-party software i.e. IDEs, Pypi, Docker registry,
•
Monitor system performance, availability, and health; troubleshoot and resolve hardware and software issues,
•
Support and maintain virtualized and workstation environments (e.g., VMware)
•
Install, configure, and troubleshoot servers, switches, and storage systems
•
Configure and support networking in mixed Linux and Windows environments
•
Document system configurations, procedures, and changes in accordance with policies and requirements
•
Collaborate effectively with team members, security personnel, and end users
•
Provide technical support and respond to operational issues through resolution
•
Participate in continuous improvement, automation, and modernization efforts
•
Perform other duties as assigned
Requirements
•
8+ years of professional experience administering Linux systems (RHEL preferred)
•
Active Top Secret clearance
•
Experience with:
•
Installation and configuration of RHEL 8 servers and workstations
•
System security, hardening (STIG), auditing, and backup strategies
•
Patch and package management
•
Virtualization technologies including VMware, Podman, Docker, Image registries, Red Hat Openshift/Kubernetes
•
Hardware and software troubleshooting
•
Networking in heterogeneous (Linux/Windows) environments
•
Strong oral and written communication skills
•
Detail oriented
•
Proven ability to work collaboratively in a team environment
•
Self-motivated, detail-oriented, and able to own issues through completion
Nice to have
Candidates who have any of the following skills will be preferred:
•
Bachelor’s degree in Information Technology, Network Engineering, Computer Engineering, or a related technical field
•
Experience with:
•
Dell servers, switches, and SAN solutions
•
VMware vSphere
•
Root Cause Analysis and documenting findings
•
DISA SCAP Compliance Checker and DISA STIG implementation
•
RHEL 8/9/10
•
NAS and/or SAN configuration and maintenance
•
Configuration management, Automation, Scripting (Ansible, Bash, Python)
•
Git/GitLab and CI/CD pipelines
•
Containers and orchestration (Podman/Docker, RHOCP/Kubernetes, minikube, image registries)
•
Relevant certifications are preferred but not required i.e.
•
Security+
•
RHCSA / RHCE / LPIC-1
*Resumes, Cover Letters, and Applications which are generated by AI will not be considered for employment.
Colorado Residents: In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information
Benefits
SciTec offers a highly competitive salary and benefits package, including:
•
4% Safe Harbor 401(k) match
•
100% company paid HSA Medical insurance, with a choice of 2 buy-up options
•
80% company paid Dental insurance
•
100% company paid Vision insurance
•
100% company paid Life insurance
•
100% company paid Long-term Disability insurance
•
Short-term Disability insurance
•
Annual Profit-Sharing Plan
•
Discretionary Performance Bonus
•
Paid Parental Leave
•
Generous Paid Time Off, including Holiday, Vacation, and Sick Pay
•
Flexible work hours
The pay range for this position is $149,000 - $184,000 / year. SciTec considers several factors when extending an offer of employment, including but not limited to the role and associated responsibilities, a candidate’s work experience, education/training, and key skills. This is not a guarantee of compensation.
SciTec is proud to be an Equal Opportunity employer. VET/Disabled.