MTSI is seeking a highly experienced Senior Cyber Security - Information Systems Security Manager (ISSM) in Dayton, OH. This senior role is responsible for shaping and managing cybersecurity strategy, Risk Management Framework (RMF) 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 Information Security Professional, executing ISSM 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 RMF activities.

Responsibilities:

• Lead cybersecurity strategy, RMF 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 RMF documentation, including SSPs, SCTMs, assessment procedures, SARs, 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.

​ ​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.

Qualifications:

Must meet Cybersecurity (DoD 8140/8570 - IAM Level II) certification requirements Possess minimum of 10 years of relevant work experience Experience working in a DoD program or product acquisition office or environment 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 A Master of Arts/Master of Science/Master of Engineering

MA/MS/ME

degree (Years of experience may be considered in lieu of a master's degree) U.S.

Citizenship Education Requirements:

Bachelor's degree in engineering, computer science, cybersecurity, networking, or programming. Certification Requirements in one or more of the following:

• Must meet position and certification requirements outlined in DoD Directive 8140 for Information Assurance Manager Level II
• Certified Information Systems Security Professional (CISSP or (CISSP-ISSEP/CISSP-ISSAP)

Clearance Requirements:

• Active Top-Secret clearance with SCI and SAP eligibility #LI-HP1