Information Systems Security Officer, Senior (ISSO-S)

ALEX is seeking a highly experienced Senior ISSO-S. The ISSO-S is responsible for leading the development, implementation, and oversight of cybersecurity policies and procedures for complex, classified systems. This role ensures compliance with federal regulations and industry standards, manages risk, and supports the system lifecycle from design through decommissioning.

Security Governance & Compliance

• Develop, implement, and maintain security policies, procedures, and protocols.
• Ensure compliance with NIST SP 800-53, RMF, FISMA, JSIG, DAAPM, and other applicable frameworks.
• Lead efforts to achieve and maintain Authority to Operate (ATO).

Risk Management & Assessment

• Conduct risk assessments and vulnerability scans using tools like ACAS, SCAP, and STIGs.
• Manage POA&Ms and ensure timely mitigation of identified vulnerabilities.
• Oversee configuration management and change control processes.

System Lifecycle Support

• Integrate security requirements into the System Development Lifecycle (SDLC).
• Maintain and update System Security Plans (SSPs) and other authorization documentation.
• Register and manage systems in eMASS or equivalent platforms.

Incident Response & Monitoring

• Coordinate cybersecurity incident response and reporting.
• Monitor system logs and network traffic for anomalies.
• Investigate security breaches and recommend corrective actions.

Collaboration & Leadership

• Serve as a key advisor to system owners and stakeholders.
• Collaborate with ISSMs, ISSEs, PMs, and AOs to ensure security posture is maintained.
• Provide security awareness training and guidance to users.

Education

• No formal education requirement.

Experience

• Demonstrated experience in required skills.

About Us. Founded in 1987 and headquartered in Marshall, VA, ALEX - Alternative Experts, LLC (ALEX) is an ISO 9001:2015-certified Women Owned Small Business that's changing the way government does business by delivering a powerful, industry-leading array of core services to help its clients achieve mission-critical objectives. ALEX provides a variety of benefits designed to help meet the needs of our employees. See a summary of ALEX's Employee Benefits for more information.

ALEX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, age, national origin, protected veteran status, or disability. Applicants must be able to perform the essential functions of the job.

In order to comply with the Equal Pay for Equal Work Act, we reasonably believe the pay range for this position is between $205k - $220K. Multiple factors are taken into account with any offer of employment by ALEX, including experience, education, and skills.

Reasonable accommodations will be made to allow employees to meet the essential functions of the job unless those accommodations cause undue hardships to the employer. To request a reasonable accommodation, contact the Human Resources Department at hr@alexinc.com.