Information System Security Officer - Marathon TS

Information System Security Officer
St. Louis, MO (Onsite)

We are seeking an Information System Security Officer onsite in St. Louis MO. Ideal candidates will possess an active Top Secret SCI with CI Poly clearance.

What we are expecting from you (i.e. the qualifications you must have):

• Operate within cleared environments to perform Information Assurance specific activities for customer needs and timelines.
• Perform assessments of systems and networks within the networking environment or enclave and identify where those systems or networks deviate from acceptable configurations, enclave policy, or applicable Agency policies and guidelines. Perform compliance audits (passive evaluation) and vulnerability assessments (active evaluation).
• Develop Risk Management Framework (RMF) process operating procedures, policies, and related documentation.
• Perform duties per NIST SP 900-137, Continuous Monitoring, and audit for anomalous or malicious user activity.
• Periodically review audits of all systems and monitor corrective actions to ensure closure of all action items.
• Manage media, including handling and control, labeling, virus-scanning solutions, and data transfers between classification domains via manual and automated processes.
• Create and enforce strict program control processes to ensure risk mitigation, system accreditation, and certification attainment support. Support will include process support, analysis support, coordination support, security certification test support, security documentation support, investigations, software research, hardware introduction and release, emerging technology research inspections, and periodic audits.

Required Skills:

• Meet requirements for DoD 8570 IAT Level 1 Professional Certification.
• Bachelor's degree
• 4 years' experience

Desired Skills:

• Meet requirements for or possess DoD 8570 IAT Level 2 Professional Certification.
• Demonstrated ability to conduct research and analysis for network and information system security principles and best practices.
• Knowledge of information security program management and project management principles and techniques.
• Familiarity with security violation mitigation measures and incident reporting actions.
• Proficiency in computer networking concepts and protocols and network security methodologies.
• Familiarity with host/network access control mechanisms. Knowledge of cybersecurity principles to manage risks tied to use, processing, storage, and transmission of data.
• Bachelor's degree
• 2 years' experience

Required Level of Security Clearance: TS/SCI with CI-Poly

Security Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration.


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Marathon TS is committed to the development of a creative, diverse and inclusive work environment. In order to provide equal employment and advancement opportunities to all individuals, employment decisions at Marathon TS will be based on merit, qualifications, and abilities. Marathon TS does not discriminate against any person because of race, color, creed, religion, sex, national origin, disability, age or any other characteristic protected by law (referred to as "protected status").