Senior System Administrator

Date Posted: 2026-06-05 • Country: United States of America • Location: US-MA-TEWKSBURY-TB3 ~ 50 Apple Hill Dr ~ CONCORD BLDG, Tewksbury Tb3 300 Concord • 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 for a security clearance. • Security Clearance Type: DoD Clearance: Secret • Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date. What You Will Do Provide IT systems administration in a heterogeneous Microsoft Windows, VMWare and Redhat Enterprise Linux environment. Provide daily checks in multiple data centers. Use understanding of Windows Server internals and Linux fundamentals, including DNS, DHCP, AD, and server replication methods. Work as a team member in a fast‑paced technological environment. Use troubleshooting techniques to resolve technical problems of moderate to high scope and complexity, including integration of hardware operating systems (OS) and program‑specific software. Perform data backup uses and technologies. Install and help configure software applications requested by end users. Work with Cybersecurity professionals to maintain security requirements. Provide documentation and training on advanced IT processes and procedures and other tasks as assigned. Be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 certification (CompTIA Security+ CE or equivalent) within 6 months of start date. Support systems operational 24x7 and occasionally require work effort beyond standard hours. Travel to other U.S. Domestic locations up to 10% per year. Full‑time 100% onsite position. Qualifications You Must Have University degree or equivalent experience with a minimum of 2 years of prior relevant experience, or an advanced degree in a related field. Ability to obtain a transferable U.S. government issued secret security clearance prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Must obtain an interim clearance before setting a start date. Windows and/or Linux experience. Experience with Active Directory, VMware, administration, backup and recovery. Experience with performing functional system checks. Preferred Qualifications Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification and an Operating System Certification). Experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF. Experience with data storage, NAS, and SAN technologies and solutions. Experience with using Information Technology project lifecycle management processes. Experience using VMware vCenter, vSphere, and ESX and/or other virtual computing methods. Experience supporting engineers in software, simulations, and hardware development. Experience with Microsoft WSUS, MECM, and/or Exchange. High Performance Computing (HPC) experience in a Linux environment. Scripting experience. Benefits Potential benefits include 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 depend on the business unit and whether or not the position is covered by a collective‑bargaining agreement. Equal Opportunity Employment 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