Principal Linux System Administrator; Secret Clearance Required

RTX Corporation is an aerospace and defense company that provides advanced systems and services for commercial, military, and government customers worldwide. The company, formed in 2020 by the combination of Raytheon and United Technologies, is headquartered in Arlington, VA.

Location(s): Tewksbury, MA;
Tucson, AZ;
Richardson, TX

• 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, such as DISA STIGs, approved configuration baselines, vulnerabilities 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.

• University degree or equivalent experience and a minimum of 5 years of relevant experience, or an advanced degree and a minimum of 3 years of relevant experience.
• Active and transferable U.S. government‑issued Secret security clearance required on day one of employment.
• Ability to obtain and maintain a Department of Defense Directive
  8140 / 8570‑compliant baseline certification (e.g., CompTIA Security+ CE) within 6 months of start date unless already held.

• 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 (RHCSA or 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 RMF activities, audit evidence, POA&M management, or classified system security requirements.
• Strong communication skills and 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.

• Compensation ranging from 86,800 USD to 165,200 USD.
• Health, wellness, retirement, and work/life benefits.
• Parental leave (including paternal), flexible work schedules, achievement awards, educational assistance, child/adult backup care.
• Career development and recognition programs.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified individuals with a disability and protected veterans in compliance with Section
503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

Eligibility: U.S. citizen. Security clearance:
Secret (active and transferable).