Cleared Hybrid Information System Security Officer (5420)

SMX is seeking an experienced Information System Security Officer (ISSO) to support a mission-critical federal program. This individual will serve as a cybersecurity professional responsible for ensuring the security, compliance, and operational integrity of enterprise information systems supporting critical mission functions. The selected candidate will work closely with System Owners (SOs), Business Process Owners, Information System Security Managers (ISSMs), and cybersecurity leadership on matters involving information system security. This role requires solid experience implementing and maintaining security controls, supporting Risk Management Framework (RMF) activities, and leading Authorization to Operate (ATO) efforts across multiple systems and projects. The ISSO – Intermediate will be responsible for evaluating security posture, mitigating risk, recommending security improvements, and ensuring compliance with federal cybersecurity requirements. This position is hybrid and requires an active Secret clearance. Essential Duties and Responsibilities Provide security advisory support to System Owners (SOs), Business Process Owners, ISSMs, and program leadership on matters related to information system security Support implementation, maintenance, and continuous improvement of security controls across enterprise systems and applications Coordinate and execute RMF activities including system categorization, control implementation, security assessments, authorization activities, and continuous monitoring Develop, review, and maintain System Security Plans (SSPs), POA&Ms, Security Assessment Plans, security procedures, and related authorization documentation Assess system security posture and recommend corrective actions to address risks, vulnerabilities, and compliance deficiencies Conduct security reviews and assessments to validate implementation and effectiveness of security controls Collaborate with engineers, system administrators, developers, and government stakeholders to ensure security requirements are integrated throughout the system lifecycle Support Authorization to Operate (ATO) activities and ongoing authorization maintenance efforts Execute vulnerability management activities including identification, remediation tracking, risk assessment, and validation of corrective actions Review and validate access control implementations, privileged account management, hardware inventories, software inventories, and security configurations Develop security reports, dashboards, metrics, and recommendations for government leadership Support audit activities, compliance reviews, inspections, and security assessments conducted by internal and external organizations Provide guidance regarding physical and logical protection of information system assets Evaluate security program effectiveness and recommend improvements to policies, procedures, and operational practices Support incident response, security investigations, and remediation activities as required Advise leadership on emerging threats, cybersecurity risks, and security improvement opportunities Required Skills & Experience Active Secret clearance required Minimum of 5 years of professional experience supporting cybersecurity, information assurance, RMF, or information system security activities Demonstrated experience serving as an ISSO, ISSM support resource, or security practitioner within a federal environment Strong experience supporting Risk Management Framework (RMF) activities and Authorization to Operate (ATO) processes Experience developing and maintaining SSPs, POA&Ms, Security Assessment Plans, authorization artifacts, and related security documentation Strong knowledge of NIST 800-53, NIST 800-37, FISMA, and federal cybersecurity requirements Experience implementing, assessing, and maintaining security controls across enterprise information systems Experience supporting continuous monitoring programs, vulnerability management, and compliance initiatives…