Engineer Network 3 with Security Clearance

ASD; San Antonio (TX); On-site; USD 160,000 - 210,000; Full time

Job summary

Northrop Grumman is seeking an Engineer Network 3 in San Antonio to design, implement, and support launch execution networks across classified and unclassified enclaves. You will lead network architecture, tuning, and RMF-aligned protections in collaboration with cyber teams.

The role requires hands-on experience with routing, switching, and enterprise network services in mission-critical environments, plus active DoD clearance eligibility. On-site in San Antonio, TX.

Qualifications

• Bachelor’s degree in a Science, Technology, Engineering, or Mathematics (STEM) discipline from an accredited institution.

Responsibilities

• Designs and plans network communications systems with detailed schematics for architecture and hardware/software selection.
• Lead end-to-end testing of network designs, validate configurations, and monitor performance for reliability and security.
• Develop and execute implementation plans for network upgrades, migrations, and enhancements with rollback procedures.
• Operate core network services (DNS, DHCP, NTP, AAA) across segmented enclaves and ensure secure baselines.
• Collaborate with ISSMs/ISSOs and cyber teams to align designs with RMF/ATO requirements and cybersecurity standards.
• Maintain and tune network security controls (firewalls, VPNs, ACLs) in mission-critical environments.

Skills

Routing & switching

RMF/ATO compliance

DNS/DHCP/NTP/AAA

Firewalls/IDS/IPS

Network automation (Ansible/Python)

VMware NSX / Cisco

NOC/SOC operations

ISSMs/ISSOs coordination

Education

Bachelor’s degree in STEM

Tools

Cisco IOS

VMware NSX

NMS/SIEM tools

Network automation tooling

Job description

Engineer Network 3 to support our Engineering & Sciences San Antonio department. As a member of the San Antonio department you’ll get to help architect and build a launch execution network, building and sustaining high availability launch and missile test networks that span classified and unclassified enclaves. As a network strong engineer with meaningful cyber depth, you will lead network design, implementation, and performance tuning while partnering with cyber teams to embed RMF aligned protections and secure baselines into the infrastructure. The qualified applicant will become part of Northrop Grumman’s Mission Systems support team in San Antonio, TX.

Responsibilities

Designs and plans network communications systems. Provides specifications and detailed schematics for network architecture. Provides specific detailed information for hardware and software selection, implementation techniques and tools for the most efficient solution to meet business needs, including present and future capacity requirements. Conducts testing of network design. Maintains technical expertise in all areas of network and computer hardware and software interconnection and interfacing, such as routers, multiplexers, firewalls, hubs, bridges, gateways, etc. Evaluates and reports on new communications technologies to enhance capabilities of the network.

This role is on site full time in San Antonio, TX and requires an active TS and SCI eligibility.

• Serve as a network engineer on a multi disciplinary team, designing and sustaining complex, multi node launch and test networks spanning classified and unclassified enclaves.
• Work with customer ISSMs/ISSOs and cyber engineering teams to develop and implement network changes in environments operating under, or seeking, an ATO/IATT, ensuring network designs align with RMF/ATO requirements.
• Design, plan, configure, and maintain enterprise scale network communications systems, delivering and maintaining detailed schematics and specifications for routers, switches, firewalls, multiplexers, bridges, gateways, and related hardware/software.
• Lead end to end testing of network designs, validate configurations, and monitor hardware and link performance to ensure proper settings, reliability, availability, and compliance with security policies and control objectives.
• Develop and execute implementation plans for network enhancements, upgrades, and migrations, coordinating with stakeholders to minimize service disruption and thoroughly documenting all changes and rollback plans.
• Engineer and operate core network services (e.g., DNS, DHCP, NTP, AAA) and segmented architectures that enforce well defined trust boundaries and enable controlled information sharing between multiple enclaves.
• Support the architecture and design of baked in cybersecurity protections by implementing and tuning network level security controls (e.g., firewalls, VPNs, ACLs, IDS/IPS, NAC) in close coordination with cyber/security teams.
• Participate in network operations activities (fault/performance monitoring, incident response support, change management), using NMS/monitoring tools and log/SIEM platforms as part of an integrated NOC/SOC construct.
• Perform physical layer installation tasks (e.g., fiber, patch panels, encryption devices) and ensure accurate as built documentation and configuration baselines are maintained.
• Produce periodic status reports, engineering change documentation, and network design artifacts; communicate technical options, trade offs, risks, and recommendations to internal and external stakeholders.

Basic Qualifications

• Bachelor’s degree in a Science, Technology, Engineering, or Mathematics (STEM) discipline from an accredited institution and 8 years of related professional/military experience in engineering; or a Master’s degree in a STEM discipline and 6 years of related experience; or a Ph.D. in a STEM discipline and 4 years of related experience.
• US Citizenship with a current DoD Top Secret security clearance and SCI eligibility/access that has been active within the last 24 months.
• DoD 8570 IAT Level II certification (e.g., Security+ CE) or equivalent prior to start.
• Hands on experience planning, implementing, operating, and troubleshooting routed and switched IP networks (e.g., IPv4, OSPF, VLANs, VPNs, firewalls) in mission critical or real time environments, including administration of Microsoft and Linux networked systems and applying foundational cybersecurity practices (e.g., hardening, secure configuration, access control) in collaboration with cyber/security teams. Preferred Qualifications:
• Proven experience acting as a network design authority or principal engineer for new deployments or major redesigns, from concept through implementation and cutover, including high and low level designs, ICDs, addressing and routing plans, firewall/ACL matrices, and NOC runbooks.
• Extensive hands on experience designing, implementing, and maintaining enterprise scale physical and virtual networks (e.g., Cisco routing/switching, firewalls, VPNs, VMware vSphere/ESXi/NSX) with well maintained network schematics and configuration baselines.
• Deep technical expertise with routing and switching in enterprise or mission networks, including route filtering, convergence tuning, VLAN/VXLAN, spanning tree variants, MLAG/port channeling, QoS and traffic engineering, and tuning network security controls (e.g., firewalls, IDS/IPS, NAC, endpoint protection); Cisco CCNP (or higher, such as CCIE) certification is strongly preferred.
• Experience architecting and supporting multi node test or launch networks for missile test ranges, weapon systems, or other real time mission systems, where latency, determinism, and availability are critical.
• Strong experience in engineering and securing DNS, DHCP, NTP, and AAA (RADIUS/TACACS+) within mission critical networks, including split horizon DNS, DNSSEC, DHCP authorization, authenticated NTP, and integration of these services with identity systems (e.g., Active Directory, identity management solutions).
• Extensive experience designing segmented architectures (user, server, management, security, out of band components) with well defined trust boundaries in multi domain or cross domain environments, including segregation and controlled information sharing between classified and unclassified networks using solutions such as guards, data diodes, and MLS/CDS systems.
• Demonstrated ability to align network architecture with RMF/ATO requirements and apply DISA STIGs/CIS benchmarks to routers, switches, firewalls, VPN gateways, and other network appliances, building standard network baselines (AAA, logging, NTP, SNMP, management access, banners, crypto settings) and verifying compliance at scale.
• Proficiency in automation, configuration management, and Infrastructure as Code for network automation (e.g., Ansible, Python, Bash, PowerShell, or similar tools), including device provisioning, configuration templating, drift detection, bulk policy updates (ACLs, QoS, routing policies), and automated compliance checks.
• Experience working within an integrated Network Operations Center (NOC) (fault/performance monitoring, event correlation, escalation workflows, collaboration with SOC personnel) combined with strong troubleshooting skills across layers 1–7 and a track record of restoring service quickly in complex environments.
• Experience leading end to end network testing and validation, including performance, resiliency, and failover testing in complex, distributed environments, and developing/executing implementation plans for network upgrades, migrations, and enhancements while minimizing mission impact; experience with voice and real time services over IP (e.g., VoIP, SIP trunking, QoS) in converged voice/data networks is highly desired.
• Strong interpersonal, written, and verbal communication skills; demonstrated ability to work with cross functional cyber, systems, software, and test teams to capture requirements, document designs and decisions, and brief options, trade offs, risks, and recommendations to both technical stakeholders and leadership/customer representatives.

This position is intended to be contracted to hire. While this is our intent, this is not a promise to hire by Northrop Grumman. This contract position aligns with our full-time role of Senior Principal Network Systems Engineer.