Senior Systems Security Engineer - RMF & Secure Network

VulnU; Sterling (VA); On-site; USD 118,000 - 225,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

401(k) plan with employer matching

Tuition reimbursement program

Employee assistance program

Job summary

RTX Collins Aerospace in Sterling, VA seeks a Systems Security Engineer to strengthen enterprise environments supporting DoD missions. You will implement RMF-compliant architectures, secure Windows/Linux environments, and develop IaC with Ansible for repeatable provisioning.

The role requires active SECRET clearance, onsite work in Sterling, and hands-on security architecture, auditing, and accreditation support across multi‑platform systems.

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM) required with minimum 5 years of relevant experience, or an advanced degree with minimum 3 years.
• Active and transferable U.S. government issued Secret security clearance is required prior to start date.
• Experience with Linux or Windows environments and administrative tasks.

Responsibilities

• Develop, implement, and maintain secure system architectures meeting DoD RMF requirements with focus on risk reduction, automation, and control effectiveness.
• Engineer, deploy, and harden enterprise network and system solutions for high security, resilience, and performance.
• Configure, secure, and maintain Windows and Linux environments using approved baselines and automation.
• Create and secure IaC artifacts (Ansible, VMware templates) for repeatable, auditable provisioning.
• Design and optimize Ansible workflows for configuration compliance and patch management across multi‑platform systems.
• Support RMF accreditation activities with Government ISSM through documentation and assessment coordination.
• Install, configure, and troubleshoot enterprise firewalls/routers/switches for secure network segmentation.
• Conduct vulnerability analysis and security validation to ensure compliant, reliable system functionality.

Skills

RMF compliance

Windows/Linux admin

Active Directory

VMware

SIEM tools

Trellix Endpoint Security

Tenable

Ansible

IaC

Education

STEM degree

Advanced degree (related field)

Tools

VMware vCenter

vSphere

ESXi

Windows Server

Linux

Job description

RTX Collins Aerospace in Sterling, VA seeks a Systems Security Engineer to strengthen enterprise environments supporting DoD missions. You will implement RMF-compliant architectures, secure Windows/Linux environments, and develop IaC with Ansible for repeatable provisioning.

The role requires active SECRET clearance, onsite work in Sterling, and hands-on security architecture, auditing, and accreditation support across multi‑platform systems.