Information System Security Manager (ISSM) in Bay St. Louis, Mississippi at Liberty Alliance LLC

Liberty Alliance, Inc. is seeking an experienced Information System Security Manager (ISSM) to oversee cybersecurity, information system security, and compliance activities supporting Department of War (DoW) programs and classified operations in Mississippi.

The ISSM will manage the security posture of classified information systems operating within a classified facility, including Risk Management Framework (RMF) activities, system authorization, continuous monitoring, and cybersecurity operations. This position will also provide technical IT support and assist with Company cybersecurity and Cybersecurity Maturity Model Certification (CMMC) compliance initiatives as needed.

Key Responsibilities

• Manage and oversee cybersecurity, security administration, and compliance of classified information systems within the classified facility.
• Develop, implement, and maintain security policies, System Security Plans (SSPs), Plans of Action and Milestones (POA&Ms), and other required RMF documentation.
• Support system authorization, continuous monitoring, and compliance activities using eMASS or other authorized Government systems.
• Conduct or coordinate vulnerability assessments, security audits, log reviews, DISA STIG compliance, and remediation of identified deficiencies.
• Oversee system configurations, hardware and software inventories, security controls, system interconnections, and change management activities.
• Manage classified data handling, removable media, authorized data transfers, media accountability, sanitization, and disposal requirements.
• Oversee user access controls, privileged accounts, security training, and compliance with classified system security procedures.
• Coordinate cybersecurity incident response, suspicious activity reporting, contingency planning, system recovery, and security-related investigations.
• Provide hands-on IT and technical support, including system configuration, maintenance, troubleshooting, software updates, and hardware management, as authorized.
• Assist with Company cybersecurity initiatives, including CMMC compliance, security documentation, control implementation, assessments, and remediation activities.
• Support applicable NIST SP 800-171 requirements and Company cybersecurity policies for systems handling Controlled Unclassified Information (CUI).
• Coordinate with Government cybersecurity representatives, Authorizing Officials (AOs), Security Control Assessors (SCAs), the Contractor Special Security Officer (CSSO), and other designated stakeholders.
• Support Government inspections, security assessments, audits, and corrective action activities to maintain system compliance and operational readiness.
• Complete all other tasks and duties as needed to help drive Liberty Alliance's Vision, fulfill our Mission, and uphold our organization's values.

Qualifications

Required

• Bachelor's degree in Cybersecurity, Information Technology, Computer Science, Information Systems, or a related field, or equivalent relevant experience.
• Minimum of 5 years of experience in information system security, cybersecurity compliance, RMF, or related DoW cybersecurity operations.
• Active Top Secret security clearance with current SCI eligibility and ability to obtain required program accesses.
• Experience supporting classified DoW or Intelligence Community information systems, preferably within a classified facility.
• Strong knowledge of DoW RMF, NIST SP 800-53, DISA STIGs, cybersecurity regulations, and security authorization processes.
• Experience developing and maintaining SSPs, POA&Ms, and other security authorization documentation.
• Familiarity with eMASS, vulnerability scanning tools, security monitoring, and continuous monitoring requirements.
• Experience with system security administration, configuration management, access controls, and cybersecurity incident response.
• Working knowledge of CMMC, NIST SP 800-171, and DoW contractor cybersecurity compliance requirements.
• Ability to independently manage cybersecurity responsibilities and coordinate with Government security authorities.
• Strong technical, analytical, organizational, and communication skills.

Preferred

• Previous experience serving as an ISSM, ISSO, or cybersecurity compliance lead supporting classified DoW programs.
• Experience with ACAS, SCAP, Splunk, or other approved cybersecurity assessment and monitoring tools.
• Familiarity with Joint Special Access Program Implementation Guide (JSIG) requirements, where applicable.
• Experience supporting Authority to Operate (ATO) packages, Government cybersecurity inspections, or CMMC assessments.
• DoD 8140-aligned cybersecurity certifications or qualifications appropriate to the assigned work role, such as CISSP or CISM, where accepted by applicable requirements.