Information System Security Officer at Mission Systems – San Antonio, Texas

Information System Security Officer

ID: 2026-70085
USA-TX-San Antonio
Required Clearance: TS/SCI with Polygraph, obtainable within reasonable time based on requirements
Posted Date: 1/13/2026
Category: Cyber
Employment Type: Full Time
Hiring Company: General Dynamics Mission Systems, Inc.
Basic Qualifications

Bachelor's degree in a related specialized area or equivalent is required plus a minimum of 2 years of relevant experience; or Master's degree plus a minimum of 0 years of relevant experience.

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

Job Opportunity: Information System Security Officer at General Dynamics Mission Systems

Position Overview:

Join our team as an Information System Security Officer (ISSO) to ensure the operational cybersecurity posture of the system remains secure. In this role, you’ll play a critical part in maintaining security configurations, managing system documentation, and protecting sensitive information from internal and external threats. Your work will directly contribute to safeguarding vital systems and supporting mission-critical operations.

What You’ll Experience:

Ensure information systems comply with ICD 503 and DoD JSIG requirements.Maintain and track essential documentation, including Accreditation Letters and Network Processing Advisories (NPA)Manage, review, and analyze system audit logs to protect against malicious insiders, external threats, denial of service attacks, and unauthorized access or disclosure of sensitive information.Create and maintain documentation associated with external connections, including Interconnection Security Agreements (ISAs).Provide support for security inspections and ensure system recovery processes restore security features and procedures properly.Manage day-to-day security operations of the network, including user accounts, sites, and interfaces with external connections.Oversee user account management, including passwords, clearances, authorizations, and privileges.Manage site-approved processing levels, printer levels, and virus definitions.Assist with Two-Person Integrity (TPI) implementation.Review and verify network interface levels and system integrity.

What You Bring to the Table:

Strong understanding of ICD 503 and DoD JSIG requirements.Experience in managing system documentation, audit logs, and security configurations.Proficiency in developing and enforcing cybersecurity policies.Knowledge of security assessments, inspections, and incident reporting.Skills in user account management and system recovery processes.Ability to analyze and report on audit logs and system vulnerabilities.

What Sets You Apart:

Extensive experience in maintaining secure information systems.Strong analytical skills for detecting and mitigating security threats.Proactive approach to managing cybersecurity operations.Commitment to continuous improvement and adherence to security standards.

Our Commitment to You:

Career development opportunities with continuous learning and growth.Competitive benefits, including 401k matching, flexible time off, healthcare, and wellness programs.Be part of a team that supports mission-critical operations and makes a tangible impact.

Requirements:

A minimum of an IAT Level II (DoD 8570/8140.01) certification at the time of hire, such as CompTIA Security+, GSEC, SSCP, or CCNA-Security.

Workplace Options:

This position is fully on-site at the GDMS San Antonio location

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 $86,091.00 - USD $92,000.00 /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

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