Senior Principal System Administrator (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 - Current Security Clearance Status: Active and existing security clearance required on day 1 Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense. We are seeking an experienced Senior System Administrator that will be working in a highly collaborative, multi‑platform and multi‑disciplined Microsoft Windows and RedHat Enterprise Linux environment. The candidate is responsible for provisioning, installation/configuration, operation, and maintenance of systems hardware and software infrastructure for classified programs. This role is a full time 100% Onsite position. **This is onsite position in McKinney, TX. ** What YOU will do: Server management (software and hardware); storage management (logical and physical); cross platform authentication and access management; data backup and restoration; software and license configuration; and workstation support. Working with Cybersecurity professionals to maintain security compliance requirements and provide documentation on advanced IT processes and procedures and other tasks as assigned. Act as a senior technical resource for the team by informally directing day-to‑day DT activities, resolving complex technical challenges, and mentoring personnel in support of operational excellence. Prioritize and assign tickets to lower‑level team members, ensuring timely resolution and effective workload distribution. Participate in meetings with customers, providing technical guidance and best practice to ensure successful outcomes. Develop, document, and enforce system administration processes, standards, and best practices. Install and configure software applications requested by end users. Provide work effort beyond standard work hours on occasion. What YOU will learn: Expertise in Multi‑Platform Environments: Enhance technical skills by working in a collaborative, multi‑platform environment that includes Microsoft Windows and RedHat Enterprise Linux systems. Proficiency in Advanced IT Systems Management: Develop in-depth knowledge of server and storage management, cross‑platform authentication, data backup/restoration, and software/license configuration for classified program support. Cybersecurity Collaboration: Gain experience working closely with Cybersecurity professionals to ensure compliance with security requirements and develop documentation for advanced IT processes and procedures. Qualifications YOU Must Have: Typically requires a University Degree and minimum 8 years prior relevant experience or an Advanced Degree in a related field and minimum 5 years of experience. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. An active DoD Secret clearance is required on Day 1 Start. Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within 6 months of start date. SME level experience with some of, but not limited to, the following technologies: Active Directory, WSUS, VMware, NETAPP, networking administration experience, Windows or Linux administration, backup, and recovery enterprise suites. Experience with Server architecture and troubleshooting methods and be able to assist in developing solutions and documentation to a variety of technical problems. Experience assisting with troubleshooting, patching, and support Windows, ESXi and Linux Systems. Experience with Windows Server internals to include DNS, DHCP, AD, and server replication methods. Qualifications We Prefer: Experience using VMWare vCenter, vSphere, Windows desktops (Windows 10, 11), Splunk and ESXi and/or other virtual computing methods. Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) and an Operating System Certification. Direct working experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF. Experience with data storage, NAS, and SAN technologies and solutions. Experience supporting engineers in software, simulations, and hardware development. Experience with Microsoft WSUS, SCCM, and/or Exchange High Performance Computing (HPC) experience in a Linux environment. What We Offer: Medical, dental, and vision insurance. Three weeks of vacation for newly hired employees. Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option. Student Loan Repayment Program. Life insurance and disability coverage. Optional coverages: pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection. Birth, adoption, parental leave benefits. Ovia Health, fertility, and family planning. Adoption Assistance. Employee Assistance Plan, including up to 10 free counseling sessions. Healthy You Incentives, wellness rewards program. Doctor on Demand, virtual doctor visits. Bright Horizons, child, and elder care services. Teladoc Medical Experts, second opinion program. Salary range: 107,500 USD - 204,500 USD. Equal Opportunity Employer 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