Sr Principal Systems Architect (Onsite)

Date Posted: 2026-09-14 Country: United States of America Location: US-CA-SAN JOSE-827 ~ 100 Headquarters Dr ~ BLDG 827 Position Role Type: Hybrid U.S. Citizen, U.S. Person, or Immigration Status Requirements: U.S. citizenship is required, as only U.S. citizens are authorized to access information under this program/contract. Security Clearance Type: None/Not Required Security Clearance Status: Not Required Applied Signal Technology managed by Collins Aerospace Applied Signal Technology (AST) is seeking a Senior Principal Systems Architect who strives for excellence and has a passion to be part of a team that strengthens our nation and improves the security of our world. https://www.rtx.com/collinsaerospace/what-we-do/industries/military-and-defense/communications/applied-signal-technology AST provides trusted strategic and tactical SIGINT solutions that secure the interests of the U.S. and its partners. AST’s work in areas such as high-capacity broadband communications, signal processing and analysis, tactical SIGINT, and wireless communications continually challenges our extraordinary engineers to resolve problems and make the world a safer place. AST’s work environment is passionate, highly collaborative and provides employees the freedom to strengthen and expand their skills, explore new and creative ideas, and work closely with our nation’s finest service members all while embracing integrity, innovation, and work-life balance.  This is an onsite position at our San Jose site. Relocation is not provided. What You Will Do:   Lead, develop, document, and implement a robust Cybersecurity mitigation strategy by ensuring Linux IT resources are patched and hardened in accordance with NIST-800-171 guidelines  Collaborate with Cyber teams to maintain and monitor system availability, performance, and logs using enterprise tools.   Leverage industry standards to build out automation workflows   Champion processes regarding hardware and software issues across physical and virtualized environments (VMWare)   Work closely with operations, supply chain and legal teams to support mission objectives.   Support audit readiness activities and respond to security vulnerability findings.   Provide mentorship and guidance to junior system administrators.  Leverage ticketing system to resolve incidents submitted by end users  Travel up to 15%  Qualifications You Must Have:   U.S. citizenship is required, as only U.S. citizens are authorized to access information under this program/contract Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience  Ability to demonstrate administration of RHEL 7/8/9, including systemd, firewalld, and SELinux.   Ability to demonstrate administration of Netapp enterprise storage.   Qualifications We Prefer:   Experience with enterprise logging, monitoring, and alerting systems.   Experience with automation tools such as Ansible.   Experience with CIS/STIG benchmarks and DoD security standards.  Linux OS Certificate (RHCSA / LPIC)  Experience with Splunk/Zabbix  Experience with High Performance Computing (HPC) Environments Experience with NetApp / OnTap tools  Experience with Enterprise Active Directory (AD) & LDAP  Experience dealing with Managed Anti-Virus (AV) solutions (ClamAV & SEM).  Scripting Experience (Bash, Python, Ansible) and Kickstart  Experience hardening systems using tools like SCAP and following STIGs.  Experience supporting engineers in software, simulations, and hardware development.  What We Offer : Collins Aerospace, an RTX company, is a leader in technologically advanced and intelligent solutions for the global aerospace and defense industry. Collins Aerospace has the capabilities, comprehensive portfolio and expertise to solve customers’ toughest challenges and to meet the demands of a rapidly evolving global market. 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 communications, missionized systems for specialized aircraft and spacecraft and collaborative space solutions. By joining our team, you’ll have your own critical part to play in ensuring our customer succeeds today while anticipating their needs for tomorrow. Are you up for the challenge? Join our mission today. WE ARE REDEFINING AEROSPACE. *Please ensure the role type (defined below) is appropriate for your needs before applying to this role Onsite : Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. Regardless of your role type, collaboration and innovation are critical to our business and all employees will have access to digital tools so they can work with colleagues around the world – and access to Collins sites when their work requires in-person meetings. Some of our competitive benefits package includes:  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 Hea