Senior Information System Security Officer (ISSO)

Everforth ECS is seeking an experienced Senior Information System Security Officer (ISSO) to work in a hybrid capacity at our Fairfax, VA office.

The Sr. ISSO will support the development, authorization, and ongoing cybersecurity compliance of Jupiter, a newly established DISA IL5 AWS environment containing CUI. The environment will house multiple U.S. Coalition Mission Partner Environments (MPEs).

This position is a demanding, high energy role that requires strong cybersecurity judgement, attention to detail, and the ability to lead day-to-day RMF and authorization activities for a new environment being built from the ground up. The Sr. ISSO will work closely with the Sr. ISSM, technical teams, and government cybersecurity team to prepare the environment for an Interim Authorization to Test (IATT) and ultimately an Authorization to Operate (ATO).

The ideal candidate has extensive ISSO experience supporting DoW programs and a strong working knowledge of RMF, NIST 800-53 controls, DISA STIGs, eMASS, POA&M management, and security authorization documentation. The candidate should be technically capable of independently evaluating DTO’s, CTO’s, CVE’s and other cybersecurity directives, reviewing control evidence and scan results, identifying compliance gaps, and working directly with technical teams to validate and remediate cybersecurity findings. Experience supporting AWS DoW environments is strongly preferred. The Sr. ISSO will provide guidance to other cybersecurity personnel and reports to the Senior Information System Security Manager.

Job Responsibilities:

• Lead RMF activities for the AWS IL5 environment throughout system development, IATT, ATO, and continuous monitoring, including security assessments, audit readiness, and authorization package updates.
• Develop, review, and maintain authorization artifacts, including security plans, control implementation evidence, vulnerability documentation, diagrams, inventories, risk documentation, policies, procedures, and SOPs.
• Maintain eMASS records, including control implementation details, artifacts, assessment results, POA&Ms, risk documentation, and continuous monitoring evidence.
• Coordinate with technical teams to collect, review, and validate security control evidence.
• Review and validate DISA STIG artifacts and supporting evidence, including checklists, scan results, remediation evidence, mitigations, and closure documentation.
• Analyze ACAS results to validate vulnerabilities, credentialed scan status, plugin output, remediation guidance, and scan coverage.
• Develop, maintain, and track POA&Ms for vulnerabilities, STIG findings, control deficiencies, assessment findings, and other identified cybersecurity risks.
• Evaluate DTOs, CTOs and other cybersecurity directives to determine potential impact to Jupiter and coordinate required validation or remediation activities.
• Work with engineering and cybersecurity teams to validate vulnerabilities and security findings, track remediation, coordinate rescans, and maintain supporting vulnerability and closure documentation.
• Review the cybersecurity impact of new AWS services, applications, Kubernetes workloads, software packages, architecture changes, and system changes and ensure associated authorization documentation remains current.
• Support and coordinate security control assessments, assessor requests, evidence reviews, findings resolution, and other activities required to prepare and maintain the system for authorization.
• Support development and execution of the continuous monitoring program, including recurring control reviews, vulnerability and STIG status, POA&M management, artifact updates, and security metrics.
• Serve as a senior cybersecurity POC for RMF, authorization, compliance, and assessment activities with program and government stakeholders.
• Provide guidance to other cybersecurity personnel and mentorship to junior staff.
• Other duties, as assigned.

• U.S. Citizen.
• Ability to obtain Secret clearance (active preferred)
• Active DoD 8140 IAT Level II Security+ (or higher) active.
• Ability to work up to 3 days a week in a hybrid capacity out of Fairfax, VA. Additional onsite support may be required based on operational or mission needs.
• Minimum 8 years of relevant cybersecurity experience, including significant experience supporting DoW information systems, RMF, security authorization, and continuous monitoring activities.
• Direct experience with RMF, NIST SP 800-53, eMASS, authorization packages, control implementation documentation, POA&Ms, and continuous monitoring activities.
• Experience with the following:
  • Leading or supporting security control assessments, assessor evidence requests, findings resolution, and authorization package reviews.
  • Analyzing ACAS results, including credentialed scan status, plugin output, scan coverage, remediation guidance and closure evidence.
  • Reviewing and validating DISA STIGs, security configuration evidence, remediation documentation, mitigations, and closure evidence.
• Working knowledge of AWS security and compliance concepts, including shared cloud responsibility, inherited controls, identity and access management, logging, network security, and security control implementation within cloud environments.
• Practical understanding of AWS, Kubernetes, Linux, Windows, Entra ID/Active Directory, networking, authentication, endpoint security, logging, and monitoring, with the ability to evaluate how these technologies affect the system's security and authorization posture.
• Ability to:
  • Develop and maintain cybersecurity documentation including System Security Plans, control implementation statements, POA&Ms, risk documentation, policies, procedures, SOPs, and continuous monitoring artifacts.
  • Analyze DTOs, CVEs, cybersecurity directives, and vulnerability notifications and independently determine potential system exposure using ACAS/Nessus and other available technical information.
  • Work directly with cloud, system, network, and application engineers to validate technical security controls, investigate findings, determine remediation approaches, and collect sufficient evidence to support RMF requirements.
  • Translate technical vulnerabilities and control deficiencies into clear mission and cybersecurity risk statements for ISSMs, system owners, government stakeholders, and Authorizing Officials.
• Strong analytical, problem solving, technical writing, and verbal communication skills, with the ability to independently investigate cybersecurity issues and communicate effectively with both technical and non-technical stakeholders.
• Strong problem-solving and decision-making capabilities, with a proven ability to weigh the relative costs and benefits of potential actions and identify the most appropriate solution.
• Highly developed interpersonal and oral/written communication skills, with the ability to effectively and professionally interact with a diverse set of stakeholders (from peers to end-users to executive management).