Sr. System Administrator; Onsite

Principal System Administrator

Location:

Marlborough, MA, USA — Full Time, Onsite, U.S. Citizen required (Secret clearance)

• Provide IT systems administration in a heterogeneous Microsoft Windows and Redhat Enterprise Linux environment.
• Apply knowledge of Windows Server internals and Linux fundamentals, including DNS, DHCP, AD, and server replication methods.
• Work collaboratively in a fast‑paced, technology‑focused team.
• Troubleshoot and resolve moderate to high‑scope technical problems involving hardware and operating systems integration.
• Collaborate with Cybersecurity professionals to maintain security requirements.
• Produce documentation and conduct training on advanced IT processes and procedures.
• Obtain DoDD 8140 / 8570 certification (CompTIA Security+ CE or equivalent) within six months of start date.
• Support systems operating 24/7, including occasional work beyond standard hours.
• Travel up to 10% per year to other U.S. domestic locations as business needs dictate.

• Bachelor’s degree and at least two years of relevant experience.
• Hands‑on experience with Windows and Linux operating systems.
• Experience in scripting and automation.
• Proficiency in help‑desk operations, ticket troubleshooting, and resolution.
• Experience collecting audit logs and performing system hardening.
• Transferable current U.S. government‑issued Secret security clearance prior to start date.
• U.S. citizenship.

• Technical SME or primary point of contact for patching, vulnerability remediation, or compliance initiatives.
• Experience with VMware virtualization technologies (ESXi, vCenter, VM lifecycle management, host upgrades).
• Experience with system hardening, STIG/EVAL STIG implementation, vulnerability remediation, and compliance.
• Experience with MECM/SCCM, PXE boot services, OS imaging, and automated software deployment frameworks.
• Experience with enterprise Windows services (Active Directory, Group Policy, identity integration).
• Familiarity with cybersecurity and compliance tooling (ACAS, SCAP, Splunk, STIG Viewer, audit support processes).
• Relocation eligible.

This role offers standard company benefits, including medical, dental, vision, life insurance, short‑term and long‑term disability, 401(k) match, and flexible spending accounts. Parental leave, paid time off, and holidays are also provided as per the applicable business unit.

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.