Principal Linux System Administrator (Secret Clearance Required)

RTX•Tewksbury, MA

6d•$86,800 - $165,200•Onsite

About The Position

The Principal Linux System Administrator will collaborate and partner with a diverse cross-section of Digital Technology, Engineering, and Program Management teammates supporting RTX’s programs across the Enterprise-Wide Area Network (eWAN) to support fast-paced, critical programs with classified information system capabilities. This role will involve supporting end-user facing systems, account maintenance, and security hardening of program resources across a geographically diverse enterprise network. RTX Corporation is an Aerospace and Defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry-leading businesses – Collins Aerospace Systems, Pratt & Whitney, and Raytheon. Its 185,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, VA. To realize our full potential, RTX is committed to creating a company where all employees are respected, valued, and supported in the pursuit of their goals. We know companies that embrace diversity in all its forms not only deliver stronger business results, but also become a force for good, fueling stronger business performance and greater opportunity for employees, partners, investors, and communities to succeed. The following position is to join our RTX Corporate, Enterprise Services.

Requirements

Typically requires a University Degree or equivalent experience and minimum 5 years prior relevant experience, or an Advanced Degree in a related field and minimum 3 years experience
An active and transferable U.S. government-issued Secret security clearance is required on day one of employment.
Must be able to obtain and maintain a Department of Defense Directive 8140 / 8570-compliant baseline certification, such as CompTIA Security+ CE or an approved equivalent, within 6 months of start date unless already held.

Nice To Haves

Experience administering Tenable Security Center, Nessus Manager, Nessus scanners, Nessus Agents, ACAS, or similar vulnerability-management platforms.
Hands-on experience creating and maintaining Ansible playbooks, roles, inventories, templates, and automation workflows for Linux administration or cybersecurity compliance.
Experience supporting security tools within air-gapped, isolated, restricted, or classified environments.
Experience with Linux and Windows patch management
Red Hat certifications, such as Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE).
Experience integrating Linux systems with enterprise logging, monitoring, endpoint protection, authentication, or cybersecurity reporting solutions.
Familiarity with security products such as Splunk, endpoint detection and response tools, host-based security solutions, compliance scanners, or configuration assessment tools.
Understanding of Risk Management Framework (RMF) activities, audit evidence, Plan of Action and Milestones (POA&M) management, or classified system security requirements.
Strong communication skills and the ability to collaborate with cybersecurity, infrastructure, engineering, program, and operations stakeholders.
Ability to independently prioritize work, resolve technical issues, and adapt to changing mission and security requirements in a fast-paced environment.

Responsibilities

Provide systems administration, sustainment, and troubleshooting support for Red Hat Enterprise Linux servers and appliances operating within Classified Digital Services environments.
Install, configure, maintain, patch, secure, and troubleshoot Linux operating systems, applications, middleware, repositories, and supporting infrastructure services.
Support the deployment, administration, and continued operation of vulnerability management technologies, including Tenable Security Center, Nessus scanners, Nessus Agents, ACAS, or related approved security products.
Coordinate vulnerability scanning activities, analyze findings, assist with remediation planning, and work with infrastructure and cybersecurity teams to reduce security risk across classified assets.
Support security hardening and compliance activities using applicable security requirements, including DISA Security Technical Implementation Guides (STIGs), approved configuration baselines, vulnerability remediation guidance, and internal cybersecurity procedures.
Develop, maintain, and execute Ansible playbooks or comparable automation solutions to support Linux configuration management, system hardening, patching, software deployment, security-tool administration, and compliance validation activities.
Identify opportunities to automate repetitive system administration, vulnerability remediation, compliance reporting, configuration validation, and operational sustainment tasks.
Support secure patching and software deployment processes for Linux systems in restricted, isolated, or classified network environments.
Troubleshoot Linux server, application, networking, authentication, storage, repository, and security-tool integration issues of moderate to high complexity.