Information Systems Security Officer (ISSO)

Job Description

Job Description

Position OverviewThe Information Systems Security Officer (ISSO) is responsible for the security, compliance, and operational integrity of MSI Defense Solutions' information systems supporting both classified and unclassified environments. The ISSO serves as the primary cybersecurity and information assurance lead, ensuring systems comply with DoD Risk Management Framework (RMF), NIST SP 800-171, NIST SP 800-53, CMMC, and other applicable federal security requirements.This position is responsible for maintaining Authorization to Operate (ATO) packages, supporting security assessments, implementing continuous monitoring activities, and safeguarding Controlled Unclassified Information (CUI) and classified information. The ISSO partners closely with Information Technology, Security, Engineering, Program Management, and government customers to ensure cybersecurity requirements are integrated throughout the system lifecycle.The ISSO will report to the Digital Technology Manager. The position requires a full-time work week spent in the office or hybrid with 3 days onsite. Normal hours are Monday through Thursday 7:00am-4:30pm and Friday 7:00am – 12:00pm. (Must be flexible to work additional hours as needed based on project requirements and deadlines.)Key ResponsibilitiesServe as the Information Systems Security Officer (ISSO) for classified and unclassified information systems.Maintain compliance with the DoD Risk Management Framework (RMF), NIST SP 800-53, NIST SP 800-171, CMMC, and applicable DoD cybersecurity policies.Develop, maintain, and update System Security Plans (SSPs), POA&Ms, Security Assessment Reports (SARs), and RMF documentation.Administer and maintain the organization's Governance, Risk, and Compliance (GRC) platform (e.g., IntelliGRC), ensuring security documentation, evidence, POA&Ms, and assessment artifacts remain current and audit ready.Support Authorization to Operate (ATO), Authority to Connect (ATC), and continuous monitoring activities.Ensure implementation and maintenance of required security controls across enterprise systems.Conduct vulnerability assessments, security audits, and remediation tracking.Coordinate vulnerability scanning, patch management, and secure system configuration.Investigate, document, and coordinate cybersecurity incident response activities.Administer user access controls and privileged account management in accordance with least privilege principles.Ensure compliance with security requirements for classified systems and secure facilities.Lead the preparation for internal audits, DCSA assessments, customer inspections, and CMMC assessments including evidence collection, artifact management, and assessor coordination.Collaborate with IT, Engineering, and Program teams to integrate cybersecurity throughout project execution.Develop and maintain cybersecurity policies, procedures, and user awareness initiatives.Support secure implementation of Microsoft 365 GCC High, Azure, Microsoft Defender, Intune, and related security technologies.Serve as the primary cybersecurity liaison for government customers and external auditors.Monitor compliance status, track remediation activities, and provide regular reporting on cybersecurity posture and outstanding compliance actions to leadership.Skills and Qualifications RequiredBachelor's degree in Cybersecurity, Information Technology, Computer Science, or related field (or equivalent experience).5+ years of cybersecurity, information assurance, or information systems security experience within a DoD or federal contractor environment.Strong knowledge of:DoD Risk Management Framework (RMF)NIST SP 800-53NIST SP 800-171CMMC Level 2STIG implementationExperience managing Authorization to Operate (ATO) packages.Experience supporting classified information systems.Experience administering Microsoft 365 GCC High, Azure Active Directory, Microsoft Defender, Intune, and endpoint security solutions.Experience conducting vulnerability management and remediation.Familiarity with SIEM solutions and continuous monitoring tools.Excellent documentation and technical writing skills.Strong communication and collaboration skills.Preferred QualificationsExperience supporting CMMC Level 2 environments or similar regulated environmentsFamiliarity with tools such as Microsoft Defender, SIEM platforms, and compliance tools (e.g., IntelliGRC)Relevant certifications (Security+, CySA+, CISSP, or similar)Experience with audit preparation and evidence collectionSecurity RequirementsU.S. Citizenship is required.An active Secret security clearance is required.Must be able to maintain eligibility for access to classified information.Physical RequirementsProlonged periods sitting at a desk and working on a computerMust be able to lift up to 30 pounds at times.Must be able to access and navigate each department at the organization's facilities.The MSI Operating CodeEvery employee at MSI is expected to operate in accordance with the MSI Operating Code. These seven principles define how we think, decide, and execute. They are not aspirational. They are the working standard by which all employees are evaluated.The Seven PrinciplesOwn It. If a problem touches your function, it is yours until it is solved or explicitly transferred. Do not wait. Do not delegate upward. Do not hide behind process. Ownership means driving to resolution, not monitoring status.Kill the Wrong Fight. Before optimizing a solution, question whether the problem is yours to solve. If an opportunity requires MSI to become something we are not, kill it fast. The discipline to say no is what protects our ability to say yes to the right things.Move Before You're Told. Speed is MSI's compounding advantage. We move when directionally correct and adjust in motion. Leaders who wait for permission are not leading. We would rather correct a fast decision than wait for a perfect one.Solve Before You Contract. Prove the integration works before formalizing the relationship. Capability first, paperwork follows. Working capability is the strongest negotiating position and the most honest form of business development.Integrate First. MSI's moat is not any single technology. It is the ability to integrate modular systems faster and more effectively than anyone else. Every decision should reinforce our position as the integration hub.Say It Now. Silence is not alignment. If you disagree, say so, with data, with reasoning, and with an alternative path. Passive execution is institutional risk.Build Beyond Yourself. If your function depends on your presence to operate, you have not built anything. Develop your people. Document your processes. Create depth that survives your absence.Benefits401(k) with employer matchDental InsuranceDisability InsuranceHealth InsuranceVision InsurancePaid Parental and Maternity LeaveLife InsurancePaid Time Off – 120 hours per year to start (prorated in first year of employment)Continuing EducationAnnual Year End Paid Holiday Closure  ClassificationPosition is full-time, Exempt MSI Defense Solutions is an Equal Opportunity/Affirmative Action Employer. We recruit, hire, train, promote, and compensate employees based on merit, qualifications, and business needs. All qualified applicants will receive consideration for employment without regard to any characteristic protected by applicable federal, state, or local law, including race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), national origin, age, disability, genetic information, protected veteran status, or any other legally protected status. MSI Defense Solutions is committed to fostering a workplace free from discrimination, harassment, and retaliation.