Cyber Systems Security Engineering Specialist

MTSI Defense Services Division is seeking an experienced Cyber / Systems Security Engineering Specialist to support PMA-261 cyber engineering and platform/system security activities across 53 E/K program environments. The role blends hands-on technical administration/security operations with Systems Security Engineering (SSE) practices, supporting secure configurations, vulnerability management, compliance, and security documentation. Plus limited MBSE experience (ability to interpret interfaces and architecture intent from program models [SysML] and technical baselines).

Primary Responsibilities:

• Execute cybersecurity compliance and engineering activities across lab, integration, and operational support environments (RDT&E and/or program networks as assigned).
• Perform vulnerability management activities including ACAS scanning coordination, patching support, remediation tracking, and security posture reporting.
• Apply DISA STIGs/SRGs for Windows, Linux, hypervisors, and network devices; support scripted evaluation where applicable.
• Support secure network segmentation concepts (VLANs, trunking, routing boundaries), firewall policy implementation/validation, and VPN administration (as directed).
• Administer and maintain Linux-based systems and services (RHEL/CentOS/Ubuntu), including directory integration and authentication controls where required.
• Support virtualization platforms (VMware ESXi/vCenter) and backup/recovery practices; help ensure availability and configuration compliance.
• Contribute to SSE/RMF-relevant artifacts and periodic submissions (plans, evidence, control implementations, scan outputs, POA&M support).
• Read/interpret relevant architecture/interface products WBBB/RIBS-P to ensure security controls align with system boundaries and intended behavior.

Qualifications:

• 5+ years' experience in DoD/DoD-adjacent IT, system administration, and/or cybersecurity support
• Strong Linux administration background (RHEL preferred) and demonstrated STIG implementation experience
• Experience with ACAS vulnerability scanning and remediation workflows
• Working knowledge of enterprise networking fundamentals (routing/switching, VLANs, firewall policy concepts)
• Experience supporting virtualization (VMware ESXi/vSphere) and backup/recovery

Desired Skills:

• HBSS/ePO client product experience
• Familiarity with GitLab administration/secure CI/CD support in segmented environments
• Basic scripting/automation (Python, PowerShell, Ansible)
• Exposure to SSE/RMF processes and artifact preparation in program environments
• Experience supporting classified spaces and handling procedures

The pay range for this position in is $100,000/year to $170,000/year; however, base pay offered may vary depending on established government contract ranges, job-related knowledge, skills, and experience, and other factors. MTSI also offers a full range of medical, financial, and other benefits, dependent on the position offered. Base pay information is based on market location. Applications will be accepted on an ongoing basis. This posting will be renewed periodically until the position is filled.