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Principal Information System Security Officer (ISSO)

Modern Technology Solutions, Inc.
401(k)
United States, Florida, Hurlburt Field
Apr 06, 2026
MTSI is seeking an Information System Security Officer (ISSO) to provide expertise in managing existing networks and creating diagrams to capture network configurations and data flows. Applicants will also support the engineering team by illustrating potential network configurations to include Tactical, National, SOCOM, and DISA infrastructure. Working with the US Government client, the candidate will assess products for reliability, perform analysis test cases and scenarios, deliver formal test reports and work within the Risk Management Framework (RMF). Provides information security support to the client, focusing primarily on integration of new systems and network architecture. Reviews security documentation to evaluate the adequacy of the security plan for upgrading networks, ensuring security solutions are effective and meet all security requirements for processing classified information.Support client in performing penetration tests, vulnerability/risk assessment analysis to support assessment and authorization utilizing the federal RMF. Help prepare documents that inform the RMF process, such as System Security Plans (SSPs), Risk Assessment Reports that intend to secure an Authority to Operate (ATO) for systems and software, as directed by the customer. This position will be located on Hurlburt Field, FL.
You'll be a great fit for this role if:
  • Self-starter, able to multi-task and perform effectively in a highly dynamic, fast-paced environment with minimal supervision.
  • Strong customer service skills; being able to work with personnel across multiple disciplines of the organization
  • Excellent oral and written communication skills.
  • Excellent time management, scheduling, and organizational skills
  • You are passionate about continuous learning and growth, and you seek opportunities to challenge yourself.
  • You are driven to make a meaningful impact through your work.
Responsibilities:
Your essential job functions will include but may not be limited to:
  • Assist managing a RMF Accreditation and Authorization process (e.g. categorizing, control selection, implementation and assessment, and system hardening).
  • Generate and maintain required Information System (IS) security documentation including SSPs, Information Assurance Standard Operating Procedures (IA SOP), Continuous Monitoring Plans, Security Control Traceability Matrices (SCTM), Risk Assessments, Plan of Action & Milestones (POA&M), equipment specifications, practices, and procedures.
  • Ensure systems are operated, maintained, and disposed of in accordance with security policies and procedures.
  • Use RMF to obtain Interim Authorities to Test (IATT), and Authorization to Operate (ATO) on quick reaction ISR systems, delivering new capabilities to the warfighter.
  • Construct and oversee the accreditation of ATO packages utilizing Enterprise Mission Assurance Support Service (eMASS) and Xacta.
  • Provide technical advice to leadership and vendors, while acting as the sole subject matter expert in Cyber Security for the organization.
  • Evaluate cyber threats and vulnerabilities to determine the need for supplementary safeguards (e.g. architecture, firewall, data flow, network access, etc.).
  • Identify areas of concern regarding the effectiveness of cyber policies being used within the organization.
  • Create and maintain organizational cyber security policies.
  • Deliver vulnerability, risk assessment, resolution, and analysis reports for ISR systems.
  • Conduct periodic reviews to ensure compliance with SSP.
  • Be knowledgeable of and comprehend customer Security Classification Guides (SCG) to determine classified system requirements.
  • Ensure configuration management for security relevant IS software, hardware and firmware is maintained and documented.
Qualifications Required:
  • DoD 8140 IAT Level II Certified (e.g. CompTIA Security+)
  • Knowledge of federal security requirements and mandates (e.g., RMF, Federal Information Processing Standards (FIPS), National Standards of Information Technology (NIST)).
  • Knowledge of Linux operating system, including experience working with Linux/Unix Command Line Interface and using regular expression queries.
  • In-depth knowledge of Microsoft Windows OS (client and server).
  • Strong understanding of SOCOM networks, Airforce networks and Cyber Security workflows.
  • Will require travel up to 15% of time within CONUS and OCONUS
Education:
  • Bachelor's degree in Computer Science, Information Technology, Information Security, or related field
  • Minimum five (5) years of experience working in an IA-related field.
Even better if you have these desired skills:
  • Master's degree in Computer Science, Software Engineering, IT Management, Cyber Security or Information Assurance
  • DoD 8140 IAM Level II Certified (e.g CASP+).
  • Ten (10) years of experience working in an IA-related field.
  • Experience configuring Linux systems to meet DoD cybersecurity requirements.
  • Master's degree in Computer Science, IT Management, Cybersecurity or Information Assurance.
  • Experience using Enterprise Mission Assurance Support Service (eMASS).
  • Experience using Xacta.
Clearance Requirements:
  • Active TS/SCI clearance to start, with Counterintelligence Scope Poly eligibility.
  • Current Counterintelligence Scope Poly, DESIRED.
U.S. Citizenship is required for this position.
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  • 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.


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