Lead Security Engineer

Security Requirement: U.S. Citizenship required

Work Location:Suitland, MD

We are seeking a Subject Matter Expert (SME)–level Lead Security Engineer to lead application security across a large-scale, cloud-native federal modernization program. This role provides technical and management leadership on major security tasks, embedding security into every phase of the System Development Life Cycle (SDLC) using a Dev Sec Ops  methodology. The ideal candidate will architect and enforce Zero Trust principles, drive Authorization to Operate (ATO) activities, and directapplicationsecurity testing, threat modeling, and vulnerability remediation across a System of Systems (SoS).

This positioninterfaces with senior Government stakeholders and the Office of Information Security (OIS), and decision-making and domain knowledge may have a critical impact on overall program implementation. May supervise others.

• Lead the design and implementation of a pplication security solutions, frameworks, and processes across all phases of the SDLC
• Implement Zero Trust (ZT) principles for applications, workloads, and data, aligned with EO 14028, OMB M-22-09, and NIST SP 800-207 (Zero Trust Architecture)
• Integrate security into Dev Sec Ops CI/CD pipelines , establishing security gates, automated code inspection, and supply-chain controls, including Software Bill of Materials (SBOM) generation
• Direct Static and Dynamic Application Security Testing (SAST/DAST) , vulnerability assessments, and penetration testing to identify, triage, and remediate security weaknesses
• Lead threat modeling exercises to analyze application architecture,identifyattack vectors, and document mitigation strategies throughout design, development, testing, and deployment
• Support the Authorization to Operate (ATO) process, including security control assessment, artifact and evidence collection, Privacy Threshold Analysis/Privacy Impact Assessment support, and Plan of Action and Milestones (POA&M) management
• Implement security controls in accordance with the NIST Cybersecurity Framework and NIST SP 800-53 , and remediate identified vulnerabilities and compliance findings
• Design and implement secure architecture patterns — secure API design, authentication/authorization, input validation, encryption, secure logging and monitoring (SIEM), and secure error/session/configuration management
• Develop and maintain metrics, dashboards, and reporting to track application security posture, threat trends, and remediation progress over time
• Support the development and management of Interagency Security Agreements (ISA) , security playbooks, and incident response in accordance with current cybersecurity policies
• Collaborate with application developers, data engineers, systems engineers, and OIS to identify and mitigate vulnerabilities, and provide expert security consultation to development teams
• Assist in FedRAMP certification activities and the assessment/remediation of independent penetration testing results, as applicable

• Bachelor’s degree in Information Technology, Computer Science, Cybersecurity, or a related field
• 15+ years of relevant IT/cybersecurity experience, providing technical and management leadership on major tasks or technology assignments (SME level)
• Certified Information Systems Security Professional (CISSP)
• Certified Cloud Security Professional (CCSP)
• Demonstrated expertise in integrating security into a Dev Sec Ops  SDLC, including CI/CD security gates and automated security testing
• Hands‑on experience implementing Zero Trust Architecture and applying NIST SP 800-53 controls and the NIST Cybersecurity Framework
• Proven experience leading vulnerability assessments, penetration testing, and threat modeling for enterprise applications
• Experience supporting the ATO lifecycle and managing POA&Ms, security artifacts, and evidence collection

• Certified Information Security Manager (CISM)
• Certified Information Systems Auditor (CISA)
• Experience generating Software Bill of Materials (SBOMs) and implementing software supply-chain security controls
• Familiarity with SIEM deployment,…