Senior DoD Network Engineer – TS/SCI Onsite

Castalia Systems; Largo (FL); On-site; USD 110,000 - 150,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401k matching

Generous PTO

Paid holidays

Professional training

Pet insurance

Job summary

Castalia Systems in Largo, Florida, is seeking a Senior Network Engineer for a 100% onsite role. You will implement and support secure voice and data networks, including CUCM, Unity, and UNIFI deployments, in DoD-aligned environments.

The position emphasizes engineering, testing, disaster recovery planning, and strong troubleshooting across LAN/MAN/WAN with security compliance and advanced collaboration platforms. A DoD-focused background is highly valued.

Qualifications

• Bachelor’s degree required; 12 months of relevant work experience, or 6 years with no degree.
• DoD 8570 IAT Level II cert (Security+ or CISSP preferred) or ability to obtain.
• Strong knowledge of computer, network, and security systems.

Responsibilities

• Configure and maintain CUCM clusters for enterprise and classified environments.
• Manage Unity Connection voicemail systems and provisioning.
• Troubleshoot VoIP, SIP trunks, and calling search spaces.
• Provide Tier III support for voice, routing, and quality issues.
• Plan upgrades, patches, and lifecycle management for CUCM/Unity.
• Deploy UniFi FX solutions within enterprise communications environments.

Skills

Troubleshooting

Network security

DoD compliance

Communication skills

Self-direction

Education

Bachelor’s degree

Tools

Juniper SRX

EX-series switches

Job description

Castalia Systems in Largo, Florida, is seeking a Senior Network Engineer for a 100% onsite role. You will implement and support secure voice and data networks, including CUCM, Unity, and UNIFI deployments, in DoD-aligned environments.

The position emphasizes engineering, testing, disaster recovery planning, and strong troubleshooting across LAN/MAN/WAN with security compliance and advanced collaboration platforms. A DoD-focused background is highly valued.