Senior Cybersecurity Engineer - DoD/ATO Expert

MSCCN; Alexandria (VA); On-site; USD 121,000 - 266,000; Full time

Job summary

MSCCN is seeking a Cybersecurity Engineer to support JIATF-401. This on-site role requires senior level expertise in security architecture, RMF/ATO, and cloud security across enterprise, hybrid, and vendor environments to protect DoD operations.

You will lead architecture discussions, advise government leaders and contractors, and coordinate with program offices to ensure proper authorization and interoperability, all with up-to-date DoD cybersecurity practices.

Qualifications

• Master’s degree in cybersecurity, information assurance, engineering, computer science, or a related field.
• Senior-level experience in cybersecurity engineering, security architecture, or a closely related field.
• Direct experience supporting RMF and ATO activities for DoW information systems.
• Experience with cloud, hybrid, and networked environments, including cybersecurity design and implementation considerations.
• Experience supporting or assessing complex systems with multiple stakeholders, security dependencies, and vendor involvement.
• Strong understanding of cybersecurity risk management, security control implementation, and system authorization processes.
• Ability to work independently, prioritize competing demands, and deliver results in a fast-paced environment without hand-holding.
• Strong written and verbal communication skills, including the ability to engage credibly with technical and non-technical stakeholders.
• Ability to represent the organization effectively during meetings, reviews, and coordination with senior leaders, mission partners, and contractors.
• Active CISSP.

Responsibilities

• Serve as the senior cybersecurity engineering subject matter expert for JIATF-401 across enterprise, operational, cloud, hybrid, and vendor-supported environments.
• Lead and advise on cybersecurity architecture, system design, integration, testing, troubleshooting, and risk-informed technical decision-making.
• Translate mission and operational requirements into secure system design considerations, cybersecurity requirements, and implementation priorities.
• Lead or support high-level technical discussions involving network architecture, cloud security design, boundary protection, system interoperability, and security control implementation.
• Assess cybersecurity risks across government-managed and vendor-managed systems and recommend practical mitigation strategies aligned to mission needs.
• Drive cybersecurity integration across systems pursuing initial authorization, reauthorization, major changes, or ongoing ATO sustainment.
• Review and advise on security architectures, implementation approaches, control inheritance strategies, test plans, technical artifacts, and assessment results.
• Participate in program reviews, design reviews, integrated product teams, engineering discussions, and senior stakeholder engagements as the organization’s cybersecurity engineering lead.
• Coordinate with Program Management Offices (PMOs), mission owners, system owners, security teams, and vendors to resolve issues affecting system authorization, compliance, and interoperability.
• Provide expert consultation on cybersecurity impacts associated with cloud adoption, cross-domain/system interfaces, externally provided services, and defense industrial base partnerships.
• Help align technical solutions with applicable Department of War (DoW), Joint, interagency, and organizational cybersecurity requirements.
• Communicate clearly and credibly with technical and non-technical stakeholders, including senior leaders, action officers, engineers, program personnel, and contractors.

Skills

Senior cybersecurity engineering

Security architecture

RMF/ATO

Cloud security

Risk management

Independent work

Communication skills

DoW liaison

CISSP

Education

Master’s degree in cybersecurity

Job description

MSCCN is seeking a Cybersecurity Engineer to support JIATF-401. This on-site role requires senior level expertise in security architecture, RMF/ATO, and cloud security across enterprise, hybrid, and vendor environments to protect DoD operations.

You will lead architecture discussions, advise government leaders and contractors, and coordinate with program offices to ensure proper authorization and interoperability, all with up-to-date DoD cybersecurity practices.