Principal Linux System Administrator (Secret Clearance Required)

Date Posted: 2026-06-04 Country: United States of America Location: US-MA-TEWKSBURY-TB3 ~ 50 Apple Hill Dr ~ CONCORD BLDG, Tewksbury Tb3 300 Concord 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 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. What You Will Do: Principal Linux System Administrator, you 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. We value diverse skills and experience, so don't hold back. Your qualification could add tremendous value to our team. Our customers come from all different backgrounds, and so do our employees. If you're passionate about what you could accomplish here, we'd love to hear from you. 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. Qualifications You Must Have: 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. Qualifications We Prefer: 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. What We Offer: Whether you’re just starting out on your career journey or are an experienced professional, we offer a robust total rewards package with compensation; healthcare, wellness, retirement and work/life benefits; career development and recognition programs. Some of the benefits we offer include parental (including paternal) leave, flexible work schedules, achievement awards, educational assistance and child/adult backup care. Work Location: Onsite, this position can be in Tucson AZ, Tewksbury MA, or Richardson TX. Role type definition: Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in‑person at one of our office locations, regardless of whether the role is designated as on‑site, hybrid or remote. Salary Range and Benefits: The salary range for this role is 86,800 USD - 165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to medical, dental, vision, life insurance, short‑term disability, long‑term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective‑bargaining agreement. Hired applicants may be eligible for annual short‑term and/or long‑term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective‑bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window. Equal Opportunity Employer 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. #J-18808-Ljbffr RTX