Cyber / Systems Security Engineering Specialist

MTSI is seeking Cyber / Systems Security Engineering Specialist (with MBSE experience) to support cyber engineering and platform/system security activities across platform 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. Some telework is authorized. 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. Required Experience & Skills 10+ 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 Current Top Secret Clearance. 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. Clearance Requirement A current SSBI or Federal Investigative Standard Tier 5 (T5) or Tier 5 Reinvestigation (T5R) within the last 5 years. A final DoD Secret or Top Secret clearance. Eligibility for Top Secret in accordance with Intelligence Community Directive (ICD) 704 and Special Access Program (SAP) in accordance with SAP Nomination Policy (SAPNP) with no disqualifying security issues that will deem a candidate ineligible for access. Great Benefits Starting PTO accrual of 20 days PTO/year + 10 holidays/year. Flexible schedules. 6% 401k match with immediate vesting up to $9k annually. Semi‑annual bonus eligibility (July and December). Company‑funded Employee Stock Ownership Plan (ESOP) – a separate qualified retirement account. Up to $10,000 in annual educational reimbursement. Other company‑funded benefits, like life and disability insurance. Optional zero‑deductible Blue Cross/Blue Shield health insurance plan. MTSI embraces nine core values including our first core value of employees come first. Consistent with our Core Values, we are committed to Equal Opportunity, making decisions without regard to race, color, religion, sex, national origin, age, military/veteran status, disability, or any other characteristics protected by applicable law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities. #J-18808-Ljbffr Modern Technology Solutions, Inc.