Sr. Trellix Cybersecurity Engineer ATR, LLCSr. Trellix Cybersecurity EngineerChantilly, VirginiaFull timeTrellix Cybersecurity EngineerLocation: Chantilly, VAEligibility: Candidate must possess an active TS/SCI with CI Polygraph clearanceJob Description: Seeking a Senior Trellix Cybersecurity Engineer with RMF ISSO expertise to architect, implement, and manage a comprehensive Trellix security environment while supporting RMF compliance activities. Support development, implementation, and maintenance of RMF packages, including System Security Plans (SSPs), Security Assessment Reports (SARs), and Plans of Action and Milestones (POA&Ms).Conduct continuous monitoring activities, vulnerability scanning, and security control assessments.