Marathon TS is hiring for a Local Defender (ISSO/SOC/Threat Analyst) in Kingsport, TN.


Principal Duties and Responsibilities:

Serve as the ISSO in support of the ISO for assigned systems, ensuring full compliance with RMF, DoDI , and NIST SP - security control baselines.

Manage and maintain all RMF-related documentation including System Security Plans (SSPs), Security Assessment Reports (SARs), Risk Assessment Reports (RARs), and Plan of Action and Milestones (POA&Ms).

Conduct security control assessments and facilitate ongoing authorization (ATO/ATC) activities.

Work directly with system owners, administrators, and the Government cybersecurity team to ensure all security controls are properly implemented and documented.

Coordinate and support all phases of the RMF lifecycle from categorization to continuous monitoring.

Lead vulnerability and compliance assessments using automated tools (...