> Markdown version of [/jobs/ext/4032296-sr-systems-security-engineer-onsite-richardson-tx-ts-sci-clearance-required](https://www.wearedevelopers.com/jobs/ext/4032296-sr-systems-security-engineer-onsite-richardson-tx-ts-sci-clearance-required). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

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

- **Company:** RTX
- **Location:** Richardson, TX, United States
- **Experience:** Expert
- **Salary:** $95,500.0 - $181,700.0
- **Contract:** Permanent contract
- **Skills:** Agile Methodology, JIRA, Bash Shell, Configuration Management, CompTIA Security+, Cyber Security, Linux, VMware ESX Servers, Information Systems Security Architecture Professional, Python (Programming Language), Linux System Administration, OpenShift, Red Hat Enterprise Linux, Ansible, Systems Integration, Virtual Machines, Virtualization Technology, Load Balancing, Containerization, Selinux, Kubernetes, Information Technology, Atlassian Tools, Docker, Vulnerability Analysis, Vmware
- **Published:** October 30, 2026
- **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-TX-RICHARDSON-C17--1717-Cityline-Dr--CITYLINE-C17/Sr-Systems-Security-Engineer--Onsite---Richardson--TX--TS-SCI-clearance-required_01885456

## About the Role

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, 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., * 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), Docker, or Podman
 * Previous experience supporting DoD or Intelligence Community mission environments
 * VMWare VCSA/vCenter/ESXi host administration, load balancing & optimization experience

## Description

* 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%