10+ years of experience in DoD/DoD-adjacent IT, system administration, or cybersecurity support
Active Secret clearance required; Top Secret preferred
Strong background in Linux administration (RHEL preferred) with STIG implementation experience
Experience with ACAS vulnerability scanning and remediation workflows
Working knowledge of enterprise networking fundamentals (routing/switching, VLANs, firewall policies)
Experience with virtualization technologies (VMware ESXi/vSphere) and backup/recovery practices
Responsibilities
Execute cybersecurity compliance and engineering activities across various environments
Perform vulnerability management activities including scanning coordination and remediation tracking
Apply DISA STIGs/SRGs for various operating systems and network devices
Support secure network segmentation and firewall policy implementation
Administer and maintain Linux-based systems and services
Support virtualization platforms and ensure configuration compliance
Contribute to SSE/RMF-relevant artifacts and submissions
Benefits
Full range of medical benefits
Financial benefits
Other unspecified benefits depending on the position offered
Full Job Description
MTSI Defense Services Division is seeking an experienced Cyber / Systems Security Engineering Specialist (with MBSE). This Support PMA-275 cyber engineering and platform/system security activities across V-22 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
10+ years experience in DoD/DoD-adjacent IT, system administration, and/or cybersecurity support
Clearance: Active Secret required; Top Secret strongly preferred
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 Qualifictaions:
HBSS/ePO client product experience
Familiarity with GitLab administration/secure CI/CD support in segmented environments
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 $120,000/year to $145,000/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.
About Modern Technology Solutions
Modern Technology Solutions, Inc. (MTSI) is a leading-edge engineering and technology company that provides critical solutions for complex military and commercial programs. MTSI has been providing engineering and technical services to the defense industry since 1993. The company has a strong focus on innovation and is committed to delivering the best solutions to its clients. MTSI has a highly skilled workforce of engineers, scientists, and technical experts who are dedicated to providing the highest quality services to its clients. The company has a proven track record of success and has received numerous awards and recognition for its work.
