Cyber Network Defender (ISSO) in San Antonio, Texas at Mission Systems

Cyber Network Defender (ISSO)

ID: 2026-73095
US-TX-San Antonio
Required Clearance: TS/SCI with Polygraph, obtainable within reasonable time based on requirements
Posted Date: 6/17/2026
Category: Engineering-Other
Employment Type: Full Time
Hiring Company: General Dynamics Mission Systems, Inc.
Basic Qualifications

Education Requirements:

Bachelor's degree in a related specialized area or equivalent relevant experience is required, plus a minimum of 2 years of relevant experience; or a Master's degree.

Clearance Requirements:

Department of Defense TS/SCI security clearance is required at time of hire with the ability to obtain a Polygraph within a reasonable amount of time. Applicants selected will be subject to a U.S. Government security investigation and must meet eligibility requirements for access to classified information. Due to the nature of work performed within our facilities, U.S. citizenship is required.

Responsibilities for this Position

General Dynamics Mission Systems has an immediate opening for a Cyber Network Defender (ISSO). This position provides an opportunity to further advance the cutting-edge technology that supports some of our nation’s core defense/intelligence services and systems. General Dynamics Mission Systems employees work closely with esteemed customers to develop solutions that allow them to carry out high-stakes national security missions.

Role and Position Objectives: Join our team as a Cyber Network Defender (ISSO) for Space, Cyber and Intelligence Systems! You'll be part of a versatile team managing the entire Cyber lifecycle, from governance and policy to accreditation, continuous monitoring, and incident response.

What You’ll Experience:

• Overseeing the Cyber lifecycle, including risk management, vulnerability analysis, and continuous monitoring.
• Ensuring compliance with government security requirements and DoD policies.
• Utilizing tools like Splunk, Nessus, and VMware for security monitoring and analysis.
• Conducting hands-on reviews and maintaining security configurations.

What You Bring to the Table:

• Proficiency in Linux and Windows operating systems.
• Experience with Risk Management Framework (RMF) and vulnerability analyses.
• Familiarity with IT government security standards like ICD 503, NISPOM, NIST, and DIACAP.
• Ability to provide RMF support and conduct security certification tasks.

What Sets You Apart:

• Strong experience with utilizing SIEM tools like SPLUNK with creation of SPLUNK dashboards.
• Strong technical knowledge of Linux and Windows commands and utilities.
• Expertise in security tools such as SCAP Compliance Checker and Clearswift.
• In-depth understanding of government IT security policies and directives.
• Hands-on experience with security accreditation and certification processes.
• Ability to ensure all security IA service requirements are met.

Our Commitment to You:

• Continuous learning and development opportunities.
• Working with award-winning teams on impactful research projects.
• Competitive benefits include 401k matching, flex time off, healthcare, and wellness programs.
• A supportive and engaging work environment with various employee resource groups.

INTERFACE:

• Primary interfaces are Government Program Information Systems Security Manager (ISSM), Operational Team Leads, internal customers, external customers, suppliers
• Establish and maintain a strong working relationship with all team members and across all teams

A minimum of an IAM Level II or IAT Level II/III (DoD 8570/8140.01) certification is required at time of hire.

CLEARANCE REQUIREMENTS:
Current or active Department of Defense Top Secret clearance with SCI eligibility required with ability to obtain a Polygraph is required at time of hire. Applicants selected will be subject to a U.S. Government security investigation and must meet eligibility requirements for access to classified information. Due to the nature of work performed within our facilities, U.S. citizenship is required.

Workplace Options: This position is based 100% on-site in San Antonio, Texas.

Salary Note

This estimate represents the typical salary range for this position based on experience and other factors (geographic location, etc.). Actual pay may vary. This job posting will remain open until the position is filled.

Combined Salary Range

USD $82,015.00 - USD $88,743.00 /Yr.

Company Overview

General Dynamics Mission Systems (GDMS) engineers a diverse portfolio of high technology solutions, products and services that enable customers to successfully execute missions across all domains of operation. With a global team of 12,000+ top professionals, we partner with the best in industry to expand the bounds of innovation in the defense and scientific arenas. Given the nature of our work and who we are, we value trust, honesty, alignment and transparency. We offer highly competitive benefits and pride ourselves in being a great place to work with a shared sense of purpose. You will also enjoy a flexible work environment where contributions are recognized and rewarded. If who we are and what we do resonates with you, we invite you to join our high-performance team!

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

#GDMS-US#