Principal Linux Administrator

Location and Employment Details El Segundo, CA (US‑CA‑EL SEGUNDO‑E04) – Onsite, full time (100%). Security Clearance Active and transferable U.S. government‑issued Top Secret security clearance required prior to start date. U.S. citizenship is required. Job Overview Provide IT systems administration in a heterogeneous Microsoft Windows and RedHat Enterprise Linux environment. Support 24x7 operations and collaborate with cross‑team stakeholders. Responsibilities Use troubleshooting techniques to resolve technical problems of basic to moderate scope, including integration of hardware and operating systems. Execute actions as directed by senior staff and project management. Engage in cross‑team collaboration and align with leadership expectations. Manage ESXi, vCenter, and Microsoft Windows domains. Work with Windows Server internals or Linux fundamentals—including DNS, DHCP, AD, and server replication methods. Apply hardware RAID, hardware and software encryption, and use server management tools. Perform data backup and restore using industry best practices. Install and configure software applications for end users. Work with Cybersecurity professionals to maintain security requirements. Maintain operational readiness 24x7, including occasional work beyond standard hours. Travel up to 10% of the time to other U.S. domestic locations as needed. Required Qualifications University degree or equivalent experience. Minimum 5 years of prior relevant experience, or an advanced degree and minimum 3 years experience. Active and transferable Top Secret security clearance prior to start date. U.S. citizenship. Experience with Windows and/or Linux systems administration. Must obtain DoDD 8140 / 8570 certification (CompTIA Security+ CE or equivalent) within 6 months of start date. Preferred Qualifications Experience deploying Windows workstations and migrating end‑user data. Experience with cloning techniques. Experience using and guiding automation tools (e.g., Ansible). Experience with operating system concepts and implementations. Microsoft Windows Active Directory Services administration and support (user and computer objects, Group Policy). Experience with network services in a Windows environment (e.g., DC, DNS, DHCP). Experience supporting desktop / workstation hardware. Experience with an IT incident/service request system. Benefits & Compensation Salary range: $95,500 – $181,700 USD. Medical, dental, vision, life insurance, short‑term and long‑term disability. 401(k) match, flexible spending accounts. Flexible work schedules. Employee assistance program, Employee Scholar Program. Parental leave, paid time off, holidays. Annual short‑term and/or long‑term incentive compensation programs (dependent on business unit & collective bargaining agreement). EEO Statement 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