Cyber Security Systems Engineer

Cyber Security Systems Engineer

Modern Technology Solutions, Inc. (MTSI) is seeking a Cyber Security Systems Engineer to support the development, integration, and protection of critical defense systems. The role ensures systems meet cybersecurity and program protection requirements across the system lifecycle, enabling secure multi‑domain operations. Ideal candidates bring experience in DoD cybersecurity frameworks and a strong understanding of systems security engineering principles.

• Develop and implement system security plans, policies, and controls in accordance with DoD and NIST standards (e.g., RMF, NIST SP 800‑53).
• Conduct cybersecurity risk and vulnerability assessments and develop mitigation strategies.
• Support architecture and design reviews from a security perspective.
• Coordinate with cross‑functional teams to ensure cybersecurity is integrated early in the systems engineering process.
• Assist with security test and evaluation (ST&E), including validation, verification, and accreditation efforts (e.g., ATO/ATC).
• Contribute to Program Protection Plans (PPPs), Security Classification Guides (SCGs), and related security documentation.

• Bachelor's degree in Systems Engineering, Cybersecurity, Computer Science, or a related field (or equivalent experience).
• 5+ years of experience in cybersecurity or systems security engineering within a DoD environment.
• Familiarity with RMF, NIST SP 800 series, and DoDI 8510.01.
• Experience supporting system accreditation packages and security documentation.
• Active Top Secret clearance with SCI eligibility required.
• DoD 8570 IAT Level II or III certification (e.g., Security+, CISSP, CASP+) required.

• Experience supporting classified DoD systems, weapon systems, or multi‑domain platforms.
• Knowledge of supply chain risk management (SCRM), anti‑tamper, and secure architecture design.
• Familiarity with cybersecurity tools such as ACAS, Nessus, STIG Viewer, and Splunk.
• Experience working closely with ISSMs/ISSEs and government security stakeholders.

• 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)
• 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

Modern Technology Solutions, Inc. (MTSI) is a 100% employee‑owned engineering services and solutions company that provides high‑demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity, and Mission Assurance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

MTSI embraces nine core values, including our first core value:
Employees come first. We challenge our co‑workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry. We are committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities.

For more information about MTSI, please visit

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