Senior HBSS MDE Administrator

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JCS Solutions LLC 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.

Job Summary:

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. Administrators will also be responsible in applying Security Technical Implementation Guides (STIGs), managing system patches, and overseeing vulnerability management processes. This role supports federal clients in maintaining compliance with the Department of Defense (DoD) and other federal cybersecurity standards. This position offers an excellent opportunity to be part of a high-performing team responsible for supporting a high-velocity collaborative environment, along with tremendous growth potential. If you are interested in a challenge and a great working environment, apply today!

What you will do:

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

1. STIG Application and Compliance:

• 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.

1. Patching and System Updates:

• 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.

1. System Hardening:

• 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.

1. Incident Response Support:

• Participates in internal/external security audits/inspections; performs 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.

1. Collaboration and Reporting:

• 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.

1. Tool Utilization:

• Trellix and Microsoft Defender.

What you wil bring:

• 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 able to adapt quickly to change
• Good writing and verbal presentation skills
• Must possess an active DoD TS/SCI Clearance at time of consideration.

How you will wow us:

• Security+ or CISSP or equivalent
• DoD IS knowledge and experience
• Security hardening scripting/automation experience
• Ansible and or MECM experience
• Microsoft OS Certification (MCSE Win 7 or other)
• Linux certification (RHCSA, CompTIA Linux, LCFS/LCFE, etc.)

JCS Solutions (JCS) is a premier technology firm providing innovative solutions and high-quality services in defense, national security, and civilian sectors. JCS offers enterprise-wide solutions including cloud computing, software development, cybersecurity, digital modernization, and management consulting for the federal government. At JCS, we elevate our customers’ mission through the application of technology and professional services. Our commitment to investing in our workforce drives innovation and progress for our clients, employees, and communities. JCS has been certified as a Great Place to Work four years in a row and was awarded Washington Post’s Top Places to Work for 2024 and 2025.


Our employees embody our core values, and we are looking for others who do too!

• Customer Experience: Strive for excellence and delight our clients
• Innovation: Embrace creative thinking to enable continual growth and powerful solutions
• Accountability: Take ownership of and pride in our actions and service delivery
• Inspire: Be inspired to be your best self and have fun in the process
• Integrity: Do the right thing, the right way, every time!
• Stewardship: The careful and responsible management of something entrusted to our care.

Commitment to non-discrimination: All qualified applicants will receive consideration for employment without regard to any status protected by applicable federal, state, or local laws.