Cyber Systems Security Engineering Specialist

Modern Technology Solutions Inc•Lexington Park, MD

3d•$100,000 - $170,000

About The Position

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).

Requirements

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

Nice To Haves

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

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.