Network/System Administrator III

General Dynamics Information Technology

. Organize, install, and support government computer systems, LANs, WANs, network segments, intranets, and data communication systems .

Posted 9/16/2026full-timeBedford • Massachusetts • United StatesMid-LevelSenior💰 $107,744 - $140,760 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates advanced technical competency in network management, cybersecurity procedures, and system security compliance, with a strong focus on supporting government computer systems and infrastructure. Proven ability to lead IT operations, manage security tools, and ensure system integrity and availability.

Highest-signal resume keywords

5+ Years Related ExperienceIAT Level III Certification (CISSP, CASP+ CE, CCNP Security, CISA)Top Secret/SCI ClearanceAdvanced Technical Competency in Networking and SecuritySAP Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Network ManagementCybersecurity ProceduresSystem Security ComplianceMicrosoft Windows AdministrationCisco NetworkingRHEL Operating Systems AdministrationGroup Policy DesignSIEM MonitoringData Communication SystemsTechnical Support

Soft Skills

Effective CommunicationCollaborationSelf-Sufficiency

Tools & Technologies

COTS ProductsGOTS ProductsMicrosoft Exchange ServerCybersecurity ToolsMonitoring ToolsEvent AlarmsTTPsSOPs

Certifications & Qualifications

IAT Level III CertificationCISSPCASP+ CECCNP SecurityCISA

Industry Keywords

LANWANCOMSECRMFCommon CriteriaSystem Security PolicyDoD PolicyCollateralSCISAP

Tech Stack

Tools & technologies

Cyber SecuritySwitchingTypeScript

About the role

Key responsibilities & impact

Organize, install, and support government computer systems, LANs, WANs, network segments, intranets, and data communication systems
Help architect, design, and analyze network models
Participate in hardware and software infrastructure upgrade decisions
Provide technical support to computer users and resolve problems
Provide day-to-day support for Collateral, SCI, and SAP activities
Lead the IT operations team in daily network management and operations
Implement capabilities vetted through Cybersecurity, ISSE, and higher headquarters to maintain JSIG/RMF Authority to Operate and continuous monitoring
Manage COTS and GOTS products for automated system security and operations/performance metrics
Assist with server, network device, and security appliance assessments
Create O&M checklists, TTPs, and SOPs
Manage SIEM monitoring tools and create or tailor complex event alarms, rules, and reports
Execute cybersecurity procedures for network management, operations, and maintenance
Monitor and analyze cybersecurity tool output for reportable incidents and residual risk
Analyze technical risk of emerging cybersecurity tools and processes
Support security incident response activities
Assist ISSM, ISSO, and ISSE with integrating and developing techniques to improve network/system confidentiality, integrity, and availability

Requirements

What you’ll need

5+ years of related experience
2+ years of SAP experience required
U.S. citizenship required
Bachelor’s degree OR Associate’s degree in a related area plus 2 years’ experience OR equivalent experience (4 years)
IAT Level III certification, such as CISSP, CASP+ CE, CCNP Security, or CISA
Top Secret/SCI clearance required to start
Must be able to attain TS/SCI with CI Polygraph
Advanced technical competency in one or more supported infrastructure, operating system, virtualization, networking, security, database, web server, monitoring, or scripting platforms
Thorough knowledge of Microsoft Windows desktop and server operating systems and Microsoft Exchange Server
RHEL operating systems administration and associated hardware knowledge as needed
Group Policy design and configuration
Working knowledge of Cisco networking, switching, and virtualization technologies
Working knowledge of LAN, WAN, data backup, COMSEC, RMF, Common Criteria, System Security Policy, PL2/PL3/PL4 environments, WSUS and/or YUM
Familiarity with DoD policy for system and network administration
Effective communication and collaboration in a high-performance team environment
Ability to work self-sufficiently with little to no oversight

Benefits

Comp & perks

Medical plan options, some with Health Savings Accounts
Dental plan options
Vision plan
401(k) plan with pre-tax and post-tax contributions and company match
Full flex work weeks where possible
Paid vacation, sick, personal, holiday, parental, military, bereavement, and jury duty leave
Short- and long-term disability benefits
Life insurance
Accidental death and dismemberment insurance
Personal accident insurance
Critical illness insurance
Business travel and accident insurance