Information System Security Engineer (Government)

This is a full-time onsite role based in the location(s) posted and is performed from the designated work location five days per week. No relocation is offered. AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers' mission. The AT&T Integrity, Compliance & Risk Management Team enables the company to bring secure, resilient, and authorization-ready services to the Public Sector market. Government cybersecurity authorizations are essential to offering and sustaining AT&T solutions for Federal Aviation Administration - Enterprise Network Services (FENS) program. This role provides the specialized technical leadership needed to translate FISMA, NIST Risk Management Framework, agency policy, and contractual obligations into scalable security practices that protect AT&T, strengthen customer confidence, and reduce business and operational risk. Serving as a trusted interface among product, engineering, operations, executive leadership, and government stakeholders, the Information System Security Engineer (ISSE) will guide services through the full cybersecurity compliance lifecycle—from early architecture and control design through assessment, Authorization to Operate (ATO), continuous monitoring, and ongoing authorization—helping accelerate market access while sustaining defensible security and compliance outcomes. The Information Systems Security Engineer (ISSE) will serve as the primary manager and technical subject-matter resource for AT&T's Tenable Security Center capability supporting Civilian, Department of Defense, State, and Local Government customers. The ISSE will own the vulnerability-management lifecycle, including scan governance, coverage, finding analysis, risk-based prioritization, remediation coordination, metrics, reporting, and continuous process improvement. The role will apply deep technical knowledge of enterprise identity, server, virtualization, logging, DNS/IP address management, and network technologies to evaluate exposure, resolve visibility and integration issues, and provide technically credible remediation guidance. Working with infrastructure administrators, security operations teams, system owners, compliance personnel, assessors, and government stakeholders, the ISSE will integrate Tenable results with Xacta-based continuous monitoring, findings, Plans of Action and Milestones, and authorization activities. The position requires independent technical judgment, strong process ownership, clear documentation and communication skills, and the ability to lead cross-functional vulnerability-management activities while escalating material risks and complex decisions to senior leadership.