Sr. Systems Security Engineer (Onsite - Richardson, TX) TS/SCI clearance required

Date Posted: 2026-10-29 Country: United States of America Location: US-TX-RICHARDSON-C17 ~ 1717 Cityline Dr ~ CITYLINE C17 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 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. We are seeking a highly skilled Senior Systems Security Engineer to support programs involving Cross-Domain Solutions (CDS) and Site-Based Security Assessments (SBSA) that supports the submittal of DoD Risk Management Framework (RMF) artifacts for operational Authority to Operate (ATO), factory accreditation, and product deployment. The ideal candidate will have strong experience in secure system design, system hardening, automation, and compliance across Linux-based environments. This role requires deep technical expertise and the ability to support complex security architectures aligned with Department of Defense (DoD) and Intelligence Community (IC) security standards.  This role will be worked onsite in Richardson, TX.   Relocation assistance is available. Active and transferable U.S. government issued DoD TOP SECRET security clearance is required prior to start date. What You Will Do: Perform system administration and framework duties to ensure proper operation of the product at factory and assist as needed for deployed systems Support cybersecurity efforts (i.e., artifact development, implementation of security controls and requirements, mitigation tracking, and controls validation) necessary to lead to successful Authority to Operate (ATO) for system. Perform system security engineering for CDS and SBSA-based systems, ensuring adherence to DoD, National Institute of Standards and Technology (NIST), and Intelligence Community security requirements Design, deploy, configure, and harden Red Hat Enterprise Linux (RHEL) systems within secure architectures Develop and maintain Ansible automation artifacts for configuration management, provisioning, and system hardening Support Risk Management Framework (RMF) accreditation efforts including documentation, security control assessment, evidence generation, and mitigation plans Conduct security analyses, vulnerability assessments, and remediation planning across system components Conduct Site-Based Security Assessments (SBSA) at customer facilities as part of program support Evaluate and monitor Commercial off the Shelf (COTS) and Government off the Shelf (GOTS) systems, applications, and services against our current architecture, RMF requirements, and application requirements Collaborate with cross-functional engineering teams to ensure secure design principles are applied throughout the lifecycle Work independently and be self-motivated to ensure the security posture of the system Troubleshoot complex security and system behavior across multi-domain, multi-level security environments Work in an enclosed classified environment, such as a Sensitive Compartmented Information Facility (SCIF) Travel up to 25% Qualifications You Must Have: Typically requires a University Degree and minimum 5 years prior relevant experience or an Advanced Degree in a related field and minimum 3 years of experience ACTIVE and transferable TOP SECRET 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 security clearances Experience in integration, testing, and requirements development Experience with Linux and Windows administration and hardening DoD 8140 certification in compliance with DoDM 8140.03M (e.g., CompTIA Security+) Experience with Risk Management Framework (RMF), Security Technical Implementation Guides (STIGs), and system accreditation deliverables Qualifications We Prefer: Networking Experience Ability to document & understand physical and wiring of system/network Experience with Atlassian/Jira toolset for task management Experience with OpenShift/Kubernetes Cybersecurity accreditation experience Experience with Ansible Experience with NAS/SAN Experience with backup/recovery Experience using Agile methodologies Bachelor’s degree in Engineering, Cybersecurity, Computer Science, or related field, or equivalent experience 5+ years of experience in system security engineering or secure system integration Expertise with Red Hat Enterprise Linux (RHEL) installation, configuration, hardening, and troubleshooting Hands-on experience with Ansible automation and infrastructure-as-code methods Experience working with Cross Domain Solutions (CDS) or similar multi-level security systems Experience with Security-Enhanced Linux (SELinux) policy configuration or troubleshooting Familiarity with Host-Based Security System (HBSS) or Endpoint Detection and Response (EDR) security tools Experience scripting with Bash, Python, or similar languages Understanding of virtualization and container platforms such as Virtual Machine Ware (VMware),