Principal Linux System Administrator - Tewksbury, MA

Principal Linux System Administrator – Tewksbury, MA

This role supports critical classified programs across multiple teams and provides secure, cost‑efficient environments for various classified IT infrastructure projects.

• Provide IT system administration in heterogeneous environments including Red Hat Enterprise Linux and Microsoft Windows.
• Apply knowledge of Linux fundamentals and Windows Server internals, including Ansible, DNS, DHCP, LDAP, AD, and server replication.
• Collaborate with teams in a fast‑paced environment, applying troubleshooting techniques to moderate‑to‑high complexity problems involving hardware and operating systems.
• Understand RAID, data backup technologies, and install/configure software applications requested by end users.
• Work with cybersecurity professionals to maintain security requirements and provide documentation and training on advanced IT processes.
• Obtain DoDD 8140 / 8570 certification (CompTIA Security+ CE or equivalent) within six months of start date.
• Develop solutions and documentation to resolve a variety of technical problems.
• Maintain systems 24/7, with occasional work beyond standard hours.
• Travel up to 10% domestically as business needs dictate.

• Bachelor’s degree with a minimum of 5years of relevant experience, or master’s degree with a minimum of 3years; or 9years of direct experience if no degree.
• Ability to obtain a transferable U.S. government secret security clearance before start date; U.S. citizenship is required.
• Experience administering Linux systems.
• Experience with LDAP, Active Directory, VMware, MySQL, or networking administration.

• Experience with VMware (vCenter, vSphere, ESX) and virtualization.
• Active DoD Secret clearance.
• DoDD 8140 / 8570 certification with an operating‑system certification.
• Background with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF.
• In‑depth Linux experience.
• Data storage expertise (NAS, SAN).
• IT project lifecycle management experience.
• Support for engineers in software, simulations, and hardware development.
• Experience with Microsoft WSUS, MECM, and/or Exchange.
• High‑performance computing (HPC) experience on Linux.
• Scripting skills.

• Competitive salary range: $86,800 – $165,200.
• Medical, dental, and vision insurance.
• Life, short‑term disability, and long‑term disability coverage.
• 401(k) with company match.
• Flexible spending accounts.
• Flexible work schedules.
• Employee assistance program and Employee Scholar Program.
• Parental leave, paid time off, and holidays.

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. 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.