Sr. Principal System Administrators Lead

Date Posted:

2026-09-30

 Country:

United States of America

 Location:

US-TX-MCKINNEY-513WC ~ 2501 W University Dr ~ WING C BLDG

 Position Role Type:

Onsite

 U.S. Citizen, U.S. Person, or Immigration Status Requirements:

Active and transferable U.S. government issued security clearance is required prior to start date.​ U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance​

 Security Clearance Type:

DoD Clearance: Secret

 Security Clearance Status:

Active and existing security clearance required on day 1

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.

Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

What You Will Do:

Serve as a senior technical authority for IT systems administration across heterogeneous Red Hat Enterprise Linux (RHEL), Microsoft Windows, Virtualization, storage, and network-connected environments supporting classified programs.

Lead the architecture, installation, configuration, integration, and lifecycle management of complex Red Hat Enterprise Linux and Windows infrastructure.

Provide technical leadership across all phases of system implementation, including requirements analysis, architecture and design, installation, integration, testing, documentation, accreditation support, deployment, sustainment, and technology refresh.

Lead complex troubleshooting and root-cause analysis efforts involving operating systems, virtualization, storage, authentication, networking, applications, and infrastructure dependencies. Develop and coordinate corrective actions for issues that span multiple technical disciplines.

Serve as a technical lead for major infrastructure upgrades, migrations, system deployments, and modernization efforts. Develop implementation strategies that minimize operational risk and disruption to mission systems.

Develop technical solutions for highly complex and unique infrastructure problems where established procedures or existing solutions may not be sufficient.

Provide advanced technical expertise in Linux and Windows environments, including DNS, DHCP, Active Directory, Group Policy, authentication, server replication, patch management, storage, virtualization, and enterprise backup and recovery.

Lead Red Hat Enterprise Linux installation, configuration, hardening, patching, troubleshooting, and sustainment activities across enterprise and classified environments.

Develop and implement automation using PowerShell, Bash, Python, Ansible, or similar technologies to improve system provisioning, configuration management, compliance, monitoring, and sustainment.

Lead technical meetings, design reviews, troubleshooting sessions, and implementation planning with Engineering, Cybersecurity, Networking, Security, program leadership, and other stakeholders.

Provide technical recommendations to program leadership regarding infrastructure architecture, system performance, cybersecurity compliance, technology refresh, capacity planning, and lifecycle management.

Serve as a mentor and technical escalation point for System Administrators and Principal System Administrators. Provide technical direction, knowledge transfer, training, and development of less-experienced team members.

Establish and improve standardized system administration processes, technical procedures, configuration baselines, troubleshooting guides, and operational documentation.

Identify opportunities to improve system reliability, availability, security, scalability, and administrative efficiency across supported environments.

Lead provisioning, installation, configuration, operation, and maintenance of hardware and software supporting Linux and Windows infrastructure for classified programs. Responsibilities include server management, virtualization, storage management, cross-platform authentication, access management, backup and restoration, software and license management, workstation support, and infrastructure monitoring.

Partner with Cybersecurity professionals to develop and maintain secure system configurations, remediate vulnerabilities, implement security controls, and maintain compliance with applicable classified computing requirements.

Evaluate vulnerability findings, system risks, and technical dependencies and develop remediation strategies that balance cybersecurity requirements with mission and operational needs.

Provide technical leadership during system outages and other critical incidents, coordinating troubleshooting across multiple functional teams and driving issues through resolution and root-cause analysis.

Support systems operating in 24x7 mission environments and provide technical leadership outside normal business hours when required to resolve critical system issues.

Maintain Department of Defense Directive (DoDD) 8140/8570 certification requirements applicable to the position.

Full-time, 100% onsite position.

Qualifications You Must Have:

Typically requires a University degree or equivalent experience and a minimum of 8 years of prior relevant experience or an Advanced Degree in a related field and a minimum of 5 years experience.

Active U.S. Secret security clearance. U.S. citizenship is required, as only U.S. citizens are eligible for the required security clearance.

Advanced experience administering and troubleshooting Red Hat Enterprise Linux and/or Microsoft Windows Server environments.

Experience serving as a technical lead for complex infrastructure implementations, migrations, upgrades, or sustainment efforts.

Experience with some but not all of the following technologies: Red Hat Enterprise Linux, Active Directory, DNS, DHCP, Group Policy, WSUS, VMware vCenter/vSphere/ESXi, enterprise backup and recovery solutions, Splunk, NAS/SAN storage, and Windows 10/11.

Qualifications We Prefer:

Experience troubleshooting complex technical issues involving multiple infrastructure components and develop solutions with limited technical direction.

Experience designing, implementing, or maintaining highly available and resilient enterprise infrastructure.

Experience developing technical implementation plans, system architecture documentation, standard operating procedures, configuration documentation, and troubleshooting procedures.

Experience scripting and automation experience using PowerShell, Bash, Python, Ansible, or similar technologies.

Experience mentoring System Administrators and providing technical leadership to senior technical personnel.

Experience collaborating across Engineering, Networking, Cybersecurity, Security, and program organizations to resolve complex technical and operational issues.

Evaluate technical risks, develop courses of action, and provide recommendations to technical and program leadership.Current DoD 8140/8570 compliant certification, such as Security+ CE or equivalent, and applicable operating system certification.

Experience with NISPOM, JAFAN, JSIG, DFARS, NIST, and/or DoD Risk Management Framework (RMF) requirements.

Experience with Red Hat Enterprise Linux administration, troubleshooting, hardening, and lifecycle management.

Experience architecting or administering VMware-based virtual infrastructure at enterprise scale.

Experience with enterprise storage technol