Job Opportunities API

SMX is seeking a highly experienced Information System Security Officer (ISSO) – Sr to support a mission-critical federal program in Washington, DC. This individual will serve as a senior cybersecurity professional and trusted advisor responsible for ensuring the security, compliance, and operational integrity of enterprise information systems supporting critical mission functions. The selected candidate will function as the principal advisor to System Owners (SOs), Business Process Owners, Information System Security Managers (ISSMs), and cybersecurity leadership on all matters involving information system security. This role requires extensive experience implementing and maintaining security controls, supporting Risk Management Framework (RMF) activities, leading authorization efforts, and providing technical guidance across multiple systems and projects. The ISSO – Sr will serve as a technical expert responsible for evaluating security posture, mitigating risk, recommending security improvements, and ensuring compliance with federal cybersecurity requirements. This position is on site in Washington, DC and requires an active TS/SCI clearance.   Essential Duties & Responsibilities: Serve as the principal security advisor to System Owners (SOs), Business Process Owners, ISSMs, and program leadership on matters related to information system security Lead implementation, maintenance, and continuous improvement of security controls across enterprise systems and applications Direct and coordinate 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 Evaluate system security posture and recommend corrective actions to address risks, vulnerabilities, and compliance deficiencies Lead security reviews and assessments to validate implementation and effectiveness of security controls Coordinate 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 Direct 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 Lead major security initiatives and provide mentorship and guidance to junior cybersecurity personnel Advise leadership on emerging threats, cybersecurity risks, and security modernization opportunities Required Skills & Experience Active TS/SCI clearance required Minimum of 8 years of professional experience supporting cybersecurity, information assurance, RMF, or information system security activities Demonstrated experience serving as an ISSO, ISSM support resource, cybersecurity lead, or senior security practitioner within a federal environment Extensive experience supporting Risk Management Framework (RMF) activities and Authorization to Operate (ATO) processes Experience developing and maintaining SSPs, POA&Ms, Security Assessment Plans, author