Principal System Administrator

Date Posted: 2026-09-02 Country: United States of America Location: US-CA-SAN JOSE-826 ~ 200 Holger Way ~ BLDG 826 Position 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, as only U.S. citizens are eligible for a security clearance​ Security Clearance Type: TS/SCI - Current Security Clearance Status: Active and existing security clearance required on day 1 Raytheon Company managed by Collins Aerospace At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world. 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. At Applied Signal Technology (AST), the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. Our team solves tough, meaningful problems that create a safer, more secure world. AST is seeking a Principal Systems Administrator to join our team.  This is an ONSITE role at our San Jose, CA location.  To find out more about AST, please click the following link - Applied Signal Technology: WHO WE ARE   What You Will Do Provide IT systems administration in a heterogeneous Microsoft Windows and Redhat Enterprise Linux environment. Understanding and knowledge of Windows Server internals or Linux fundamentals to include DNS, DHCP, AD, and server replication methods.  Working as a team member in a fast-paced technological environment.  Use troubleshooting techniques to resolve technical problems of a moderate to high scope and complexity to include the integration of hardware and operating systems (OS). Work with Cybersecurity professionals to maintain security requirements.  Provide documentation and training on advanced IT processes and procedures and other tasks as assigned. Must be able to obtain certification requirements (CompTIA Security+ CE or equivalent certification) within a reasonable amount of time Systems are operational 24x7 and occasionally require work effort beyond standard work hours. Travel required as business needs dictate to other US Domestic locations, up to 10% per year. Qualifications You Must Have Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience Experience with Windows and Linux Operating systems. Experience with scripting. Experience with helpdesk operations, ticket troubleshooting and resolution. Experience with audit logs collection. Experience with system hardening. Experience with working in a team environment and collaborating with others. Experience working face to face with others and being comfortable in a demanding environment. Active and transferable U.S. government issued Top Secret SCI (TS/SCI) security clearance is required prior to start date with the ability to obtain a polygraph after start. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Qualifications We Prefer Experience serving as a technical SME or primary point of contact for patching, vulnerability remediation, or compliance initiatives. Experience with VMware virtualization technologies, including ESXi, vCenter, VM lifecycle management, and host upgrades. Experience with securing system configurations, system hardening, STIG/EVAL STIG implementation, vulnerability remediation, and compliance. Familiarity with cybersecurity and compliance tooling, such as ACAS, SCAP, Splunk, STIG Viewer, and audit support processes. Experience with MECM/SCCM, PXE boot services, OS imaging, and automated software deployment frameworks. Experience with enterprise Windows services, including Active Directory, Group Policy, and identity integration. Experience working in a classified environment. Existing TS/SCI with polygraph 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  ​  Tuition reimbursement program ​  Student Loan Repayment Program  ​  Life insurance and disability coverage  ​  Optional coverages you can buy 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    ​  Autism Benefit  ​  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  ​  Eligible for relocation  And More!  Learn More & Apply Now!​   Do you want to be a part of something bigger? A team whose impact stretches across the world, and even beyond? At Collins Aerospace, our Mission Systems team helps civilian, military and government customers complete their most complex missions — whatever and wherever they may be. Our customers depend on us for intelligent and secure communication