HBSS Administrator

Description

Leidos is seeking a skilled Senior HBSS Administrator in Fort Belvoir, VA to join the I3TS team supporting DTRA. The I3TS program provides enterprise-wide IT support to enable DTRA’s Information Management & Technology Directorate (ITD) to consolidate, modernize, and continuously innovate the delivery of IT services and mission capabilities to DTRA’s internal and external mission partners operating in CONUS and OCONUS locations.

The candidate will be responsible for ensuring the security and integrity of IT systems by running their Endpoint Security with experience in Trellix and Microsoft Defender. The Administrator will also apply Security Technical Implementation Guides (STIGs), manage system patches, and oversee vulnerability management processes. This role supports federal clients in maintaining compliance with the Department of Defense (DoD) and other federal cybersecurity standards.

The candidate will be responsible for identifying points of vulnerability and non‑compliance with established Information Assurance (IA) guidelines, recommending mitigation strategies, and assisting users as needed in a classified computing environment. The selected candidate must work independently and with a team of IT analysts, administrators, and engineers. Excellent verbal and written communication skills are required. The candidate must also perform well in a high‑energy environment and adapt to shifting priorities.

• Continuous upkeep, monitoring, analysis, and response to Information System, network and security events using Endpoint Security tools such as Trellix and Microsoft Defender.

• Implement and maintain Security Technical Implementation Guides (STIGs) on Endpoint Security Tools.
• Conduct regular STIG compliance checks using tools like SCAP Compliance Checker and STIG Viewer.
• Document STIG configurations and remediation actions to ensure audit readiness.

• Manage and deploy operating systems and application patches in accordance with federal patch management policies.
• Coordinate patch schedules to minimize operational impact while meeting compliance deadlines.
• Verify patch deployment success and troubleshoot any issues arising from updates.

• Harden systems by applying best practices and federal security guidelines to reduce attack surfaces.
• Maintain configuration baselines and ensure systems adhere to DoD and NIST standards.

• Participate in internal/external security audits/inspections; perform risk assessments and Continuous Monitoring.
• Assist in identifying and responding to security incidents related to vulnerabilities or misconfigurations.
• Document incidents and contribute to after‑action reports for continuous improvement.

• Work closely with system administrators, engineering staff, and compliance teams to ensure cohesive security operations.
• Prepare detailed reports and briefings for federal clients on STIG compliance, patching status, and vulnerability management efforts.
• Develop, implement and enforce Information Security Policies and Procedures.

• Trellix and Microsoft Defender.

• BS bachelor’s degree with 8‑12 years’ experience or 6‑10 years of IA experience without a degree. Specific experience, education and training may be considered in lieu of degree.
• A Current DoD 8570 baseline certification
• HBSS 301 Certification
• Understanding of the Risk Management Framework (RMF), NIST, ICD, and CNSS standards.
• Familiarity with network technologies (LAN & WAN) and best practices within a classified environment to include crypto and key management.
• STIG compliance, SCC and STIG Viewer experience, and ACAS expertise.
• Expert with Microsoft Windows, Linux, and system virtualization in a secure network environment.
• Must be able to work in a constantly changing regulatory environment with short, mid, and long‑term timelines for remediating any non‑compliance.
• Must be able to work well within a team environment and adapt quickly to change.
• Good writing and verbal presentation skills.
• Must possess an active DoD TS/SCI Clearance at time of…