Information System Security Engineer (ISSE)

Cyber Defense Technologies; Largo (FL); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Competitive salary

Benefits package

Career development

Job summary

Cyber Defense Technologies (CDT) is seeking an experienced Information System Security Engineer (ISSE) for a DoD program in Largo, FL. The role is hands-on, providing on-site security engineering, systems administration, and information assurance support to the program.

Active Secret clearance is required; Top Secret is preferred. Responsibilities include security engineering across the system life cycle, continuous monitoring with Nessus/ACAS, Trellix, and Splunk, and coordinating with

Qualifications

• 8+ years of deploying, configuring, maintaining, and monitoring computer systems and networks.
• Experience with administering, maintaining, implementing upgrades, and ensuring readiness of classified systems.
• Knowledge of Cisco ISE/Forescout CounterACT NAC technologies preferred.
• Technical certifications such as CISSP, CCNA, Security+ or RHCSA.
• DISA ACAS and Trellix Certifications preferred.

Responsibilities

• Provide on-site security engineering and IA support for a DoD program.
• Perform Site-Lead/Management duties for a small team of System Administrators and ISSEs.
• Provide senior-level security engineering and development support across the system life cycle.
• Conduct continuous monitoring and security testing with Nessus, ACAS, Trellix, and Splunk Enterprise.
• Develop and maintain authorization/re-authorization documentation to conform with standards.
• Coordinate with upstream providers such as DISA and C5ISR.
• Implement mitigations and patch requirements for identified findings.

Skills

Team leadership

Security engineering

RMF/NIST/NISPOM

DoD compliance

Tools

VMware vSphere

Enterprise Linux

Nessus/ACAS

Trellix

Splunk

Palo Alto

Job description

Information System Security Engineer (ISSE)

• Largo, Florida

Overview:

CDT is seeking an experienced and skilled ISSE for a DoD program in Largo, FL.This position is hands‑on technical and will provide on‑site security engineering, systems administration, and information assurance support to the program.

Clearance Requirements:

An active Secret is required, Top Secret is preferred. Candidates who do not meet these clearance requirements will not be considered.

Responsibilities:

• Experience with administering, maintaining, implementing upgrades, and ensuring the readiness of several classified virtual enterprise-system and corresponding technologies (e.g., VMware vSphere, Enterprise Linux, Cisco Systems (Switch, Router, NGFW), Palo Alto, Windows Server, Windows Workstation).
  • Knowledge of Cisco ISE/Forescout CounterACT NAC technologies preferred.
• Perform Site-Lead/Management duties that support the workflow and project goals for a small team of System Administrators and Information Security Engineers.
• Provide senior‑level security engineering and development support throughout the system life cycle.
• Perform appropriate continuous monitoring and systems security testing using tools such as Nessus Security Center/ACAS, Trellix, and Splunk Enterprise.
• Provide mitigation solutions for identified findings and patching requirements.
• Ensure that proposed system changes are reviewed and that implemented system modifications do not adversely impact the security of the system. (e.g., Change Management)
• Maintain local Trellix/ENS installations and upstream connections.
• Work with upstream service providers such as DISA and C5ISR.
• Ensure that authorization/re‑authorization support documentation is developed and maintained in conformance with applicable standards.
• Assist with the client’s progress towards completion of POA&Ms.

Technical Areas of Expertise:

• Performing enterprise software installations and upgrades.
• Enterprise Linux (Red Hat, OEL, Fedora) experience.
• Ansible or PowerShell automation experience preferred.
• VMware vSphere Experience (ESXi, vCenter, etc.)
• Windows Workstation and Server deployment and administration experience.
• RMF, NIST, and NISPOM requirements, configurations, settings, and documentation.
• Network engineering experience highly sought after.

Qualifications:

• 8+ years of experience in deploying, configuring, maintaining, and monitoring computer systems and networks.
• Previous team leadership experience.
• Experience with implementing highly technical solutions and reporting their importance to the organization and stakeholders.
• Technical certifications such as a CISSP, CCNA, Security +, RHCSA, or similar.
• DISA ACAS and Trellix Certifications preferred.

Why Join Cyber Defense Technologies?

At CDT, we offer a collaborative and inclusive work environment where your expertise in finance and HR can help shape the future of cybersecurity and engineering solutions. This position offers the opportunity to lead financial strategies while supporting HR initiatives in a fast‑paced, government contracting environment.

Compensation and Benefits:

• Competitive salary based on experience.
• Comprehensive benefits package, including health, dental, and retirement plans.
• Opportunities for professional development and career advancement.

CDT is committed to hiring and retaining a diverse workforce. We are an Equal Opportunity employer making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class.