Sr. ISSO - Hybrid

• Conduct security assessments, evaluate compliance posture, and manage RMF activities supporting accreditation efforts.
• Develop and maintain SSPs, POA&Ms, accreditation documentation, and security artifacts within XACTA.
• Coordinate IATT and ATO activities with stakeholders, system owners, and Authorizing Officials.
• Implement, assess, and monitor NIST 800-53 security controls while supporting audit and assessment events.
• Collaborate with engineers, developers, administrators, and security personnel to maintain compliance and implement risk mitigation strategies, including Zero Trust principles.

• 18+ years of cybersecurity, security engineering, systems engineering, or related experience.
• Experience with RMF, accreditation processes, and compliance management.
• Experience using XACTA and supporting IATT and ATO activities.
• Proficiency with Splunk.
• Experience implementing and assessing NIST 800-53 security controls.
• Experience with ICD 503 and related security frameworks.
• Experience developing and maintaining SSPs, POA&Ms, SAPs, and assessment documentation.
• Prior ISSO or ISSE experience.
• Current Security+ or equivalent IAT Level II/III certification.
• Active TS/SCI with Active Polygraph., * Experience leading cybersecurity programs and enterprise security initiatives.
• Strong customer-facing, stakeholder management, and leadership skills.
• Experience working with ISSMs, SCAs, system owners, and Authorizing Officials.
• Knowledge of cloud-native security environments.
• Experience implementing Zero Trust architectures.

· Salary Range: $145,000 - $205,000+ depending on experience · Full Benefits Package: PTO, Paid Holidays, Medical, Dental, Vision, 401K, Tuition Reimbursement, Sick Leave as Required by Law #LI-KD1 #LI-Hybrid SEO Keywords: Senior ISSO, Information Systems Security Officer, Cybersecurity Compliance, RMF, Risk Management Framework, XACTA, NIST 800-53, Security Controls, Accreditation, ATO, IATT, ICD 503, Splunk, SSP Development, POA&M Management, Security Engineering, Security Assessment, Zero Trust, TS/SCI Polygraph, Information Assurance, Enterprise Cybersecurity, ISSE, Governance Risk and Compliance, Cloud Security, Federal Cybersecurity, Security Authorization, Risk Management, Mission-Critical Systems, Reston, Herndon, Fairfax, McLean, Annapolis Junction, Baltimore, Washington DC, Arlington, Alexandria, Chantilly, Centerville