Sigma Defense

Software-driven CJADC2 and C5ISR systems

Network Engineer 1-3

Network Engineering & AdministrationUpdated on Nov 11

Full-timeSan Diego, CA, USA$75k - $140k /yrIn-person

About the Job

Requirements

Network Engineer I requires 0–2 years of experience; Network Engineer II requires 3 or more years; Network Engineer III requires 7 or more years.
Knowledge or experience with Network Access Control platforms, including Cisco ISE, Aruba ClearPass, FortiNAC, and Forescout.
Knowledge or experience with next-generation firewalls, including Cisco Firepower, Palo Alto, and Zscaler.
Knowledge or experience with network equipment and services, including switches, routers, wireless controllers and access points, proxy servers, voice over IP, and network time protocol services.
Knowledge or experience with deployment automation tools, including Ansible, Python, and PowerShell.
Knowledge or experience delivering network artifacts, including IP plans, network templates, cable tables, network diagrams, ports and protocols documentation, and configuration guides.
Security+ or CISSP certification and at least one industry certification: CCNA or DevNet Associate for Network Engineer I and II, or CCNP or DevNet Professional for Network Engineer III.
U.S. citizenship is required.
The candidate must possess or be able to obtain an active Secret security clearance or higher.
A bachelor's or technical degree from an accredited college or university is required; the field of study is unspecified.

Responsibilities

Configure, install, and maintain network equipment, software, and services across the Navy Enterprise Network architecture, including switching, routing, firewalls, proxies, wireless, call managers, network access control, voice over IP, and network time services.
Design, develop, implement, and troubleshoot virtual local area networks, routing protocols, IP addressing plans, and wide area network connectivity.
Integrate external services, including a wide variety of connected systems.
Apply and validate network-related Security Technical Implementation Guides in coordination with cybersecurity personnel to ensure compliance with Department of Defense security standards.
Create, maintain, and update installation documentation, network diagrams, IP schemas, port mappings, and scripts and configurations for automated installations.
Conduct diagnostics and fault isolation during official and unofficial test events as well as production installations.
Collaborate with systems, software, and cybersecurity engineers to deliver secure and resilient network operations.
Participate in shipboard testing, validation, and documentation.
Support the design, implementation, and sustainment of the Navy's enterprise networks, including high-availability networks in shipboard and lab environments, throughout the lifecycle from installation through sustainment.
Support initiatives including software-defined wide area networking, IPv6 migration, zero-trust networks, and cross-domain network solutions.
Work with subject matter experts in cybersecurity, systems management, systems engineering, and quality assurance to understand system needs and goals and shape network requirements.

1520 - Network Engineer I - III

Sigma Defense · San Diego, United States · Full-time · Posted 2026-11-10

Salary: USD 75,000–150,000

Workplace: on_site

Department: IMS (IMSENG, IMSPRG, IMSNM, IMST&R)

Description

Sigma Defense is seeking a Network Engineer I-III to support the design, implementation, and sustainment of the Navy’s enterprise networks. The hired candidate will design, configure, secure, automate, and document high-availability networks in both shipboard and lab environments while supporting the full lifecycle from installation through sustainment. This includes working on DoD initiatives such as SD-WAN, IPv6 Migration, Zero Trust Networks and Cross-Domain Network solutions. They will work with SMEs in Cybersecurity, Systems Management, Systems Engineering, and Quality Assurance to learn the needs and goals of the system and shape the requirements of the network.

Equal Opportunity Employer/Veterans/Disabled: Sigma Defense Systems is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

Requirements

Network Engineer I:

0-2 Years of Experience.
Knowledge of Network Access Control (Cisco ISE, Aruba ClearPass, FortiNAC, Forescout).
Knowledge of Next-Gen Firewalls (Cisco Firepower, Palo Alto, Zscaler).
Knowledge of Network Devices such as Switches, Routers, Wireless Controllers/APs, Proxy Servers, VOIP, and NTP services.
Knowledge of deployment automation tools (Ansible, Python, PowerShell).
Knowledge of delivering network artifacts such as IP plans, network templates, cable tables, network diagrams, ports/protocols documentation, and configuration guides.
Security+ or CISSP and at least one industry certification (CCNA/DevNet Associate).
Must be a U.S. citizen.

Network Engineer II:

3+ Years of Experience.
Experience with Network Access Control (Cisco ISE, Aruba ClearPass, FortiNAC, Forescout).
Experience with Next-Gen Firewalls (Cisco Firepower, Palo Alto, Zscaler).
Experience with Network Devices such as Switches, Routers, Wireless Controllers/APs, Proxy Servers, VOIP, and NTP services.
Experience with deployment automation tools (Ansible, Python, PowerShell).
Experience with delivering network artifacts such as IP plans, network templates, cable tables, network diagrams, ports/protocols documentation, and configuration guides.
Security+ or CISSP and at least one industry certification (CCNA/DevNet Associate).
Must be a U.S. Citizen.

Network Engineer III:

7+ Years of Experience.
Expertise with Network Access Control (Cisco ISE, Aruba ClearPass, FortiNAC, Forescout).
Expertise with Next-Gen Firewalls (Cisco Firepower, Palo Alto, Zscaler).
Expertise with Network Devices such as Switches, Routers, Wireless Controllers/APs, Proxy Servers, VOIP, and NTP services.
Expertise with deployment automation tools (Ansible, Python, PowerShell).
Expertise with delivering network artifacts such as IP plans, network templates, cable tables, network diagrams, ports/protocols documentation, and configuration guides.
Security+ or CISSP and at least one industry certification (CCNP/DevNet Professional).
Must be a U.S. Citizen.

Computer Software/Programs:

Network Access Control
Switching/Routing
Firewall
Deployment Automation

Personnel Clearance Level:

Candidate must possess or have the ability to obtain an active Secret security clearance or higher.
Clearance may be sponsored for the right candidate.

Education Requirements:

Bachelor's or Technical Degree from an accredited college or university in an unspecified field of study.

Essential Job Duties (not all-inclusive):

Configure, install, and maintain network equipment, software and services across Navy Enterprise Network architecture to include switching, routing, firewall, proxy, wireless, call managers, network access control, voice over IP, and network time services.
Design, develop, implement, and troubleshoot VLANs, routing protocols, IP addressing plans, and WAN connectivity.
Integrate external services including a wide variety of connected systems.
Apply and validate network-related STIGs in coordination with cybersecurity personnel to ensure compliance with DoD security standards.
Create, maintain, and update installation documentation, network diagrams, IP schemas, port mappings, and script/configurations for automated installations.
Conduct diagnostics and fault isolation during official and unofficial test events as well as production installations.
Collaborate with systems, software, and cybersecurity engineers to deliver secure and resilient network operations.
Participate in shipboard testing, validation, and documentation.

Salary Ranges:

Network Engineer I: $75,000 - $100,000 annually.
Network Engineer II: $85,000 – $115,000 annually.
Network Engineer III: $120,000 – $140,000 annually.

Benefits

Dental and Vision Insurance
Medical Insurance to Include HSA, FSA, and DFSA Plans
Life and AD&D coverage
Employee Assistance Program (EAP)
401(k) Plan with Company Matching Contributions
160 Hours of Paid Time Off (PTO)
12 (Floating) Holidays
Educational Assistance
Highly Competitive Salary

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About the Company

Sigma Defense

Software-driven CJADC2 and C5ISR systems

Sigma Defense provides software-driven solutions that improve military communications and decision-making. It specializes in integrating advanced technologies, data analytics, and communication networks to create interoperable systems that share real-time information across all military services and agencies. Its CJADC2 focus means it bridges legacy systems with modern technology to speed access to data and enhance decision-making through sensor analysis and strong network security. The portfolio includes C5ISR, SATCOM, and DevSecOps, and features a Tactical Relay System (a U.S. Government Program of Record) that transports and distributes tactical ISR data. The company uses DevSecOps to enable rapid, secure deployment of capabilities to front-line users, with a team of veterans and technologists developing hardware and software solutions to improve decision quality, speed, and certainty in military operations.

Company size: 51-200
Company stage: Not listed
Total funding: Not listed
Headquarters: Warner Robins, GA
Founded: 2006

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