New

Systems Security Engineer-Senior

Modern Technology Solutions, Inc.
401(k)
United States, Ohio, Dayton
Apr 03, 2026
MTSI is seeking a highly experienced Senior System Security Engineer (SSE) with Platform Information Technology (PIT) expertise to serve as the lead cybersecurity authority for acquisition programs. This senior role is responsible for shaping and managing cybersecurity strategy, Cybersecurity Assessment and Authorization (A&A) compliance, and continuous monitoring from concept and development through production and fielding until the system is transitioned to a separate sustainment team. The successful candidate will represent the customer as an experienced System Security Professional, executing SSE responsibilities for both PIT and ground support equipment. This includes defining, refining, and integrating cybersecurity requirements; ensuring compliance with applicable laws, regulations, and directives; and independently supporting the program office across all Cybersecurity Engineering activities. This position demands technical expertise, a strong understanding of cybersecurity principles, and the ability to translate requirements into actionable engineering and operational solutions. If you are a motivated professional with a passion for securing critical systems, we encourage you to apply. Key Responsibilities: * Lead cybersecurity strategy, Cybersecurity A&A implementation, and continuous monitoring for PIT and PIT CS systems. * Integrate security requirements into system design, development, upgrades, and operational processes. * Advise Information System Owners and security leadership on system impact levels, risk posture, and compliance with laws, regulations, and policies. * Assess threats, vulnerabilities, and system changes; recommend, implement, and validate appropriate security controls. * Review, approve, and oversee the development of A&A documentation, including ITCSCs, AARs, SSPs, SCTMs, CMPs, SARs, RARs, MOPRs, IRPs, and POA&Ms. * Conduct, verify, and document security assessments, ensuring accuracy, completeness, and readiness for authorization. * Prepare and submit full system authorization packages and provide written authorization recommendations to the Authorizing Official (AO). * Apply secure architecture, engineering, coding, and configuration principles across all phases of system development and operation. * Evaluate system, network, and software designs for security risks and recommend effective mitigation strategies. * Support teams developing new systems or upgrading legacy systems by providing expert cybersecurity guidance. * Identify and resolve integration challenges resulting from new capabilities entering existing infrastructures. * Stay informed on emerging security technologies, threats, vulnerabilities, and best practices to strengthen system resilience. Qualifications: 15+ years of relevant Cybersecurity or Information Systems experience. Must meet Cybersecurity (DoD 8140, Work Codes 631 & 652; Intermediate level) certification requirements oSecurity+, CCSP, Cloud+, CSSLP & GSEC certs * Experience working in a DoD program or product acquisition office or environment Education: BS Degree must be from a ABET accredited or CAE designated institution. Have no less than three (3) years' experience in a Special Access Program (SAP) and/or Sensitive Compartmented Information (SCI) environment within the last five (5) years * Top-Secret Security Clearance with ability to obtain SCI. * U.S. Citizenship #LI-DB1 Interesting Work: Our co-workers support some of the most important and critical programs to our national defense and security. Values: Our first core value is that 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. 100% Employee Owned: We have a stake in each other's success, and the success of our customers. It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year. Great Benefits - Most Full-Time Staff Are Eligible for: 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 Track Record of Success: We have grown every year since our founding in 1993. 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 MTSI delivers capabilities to solve problems of global importance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide. For more information about MTSI, please visit www.mtsi-va.com 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.