Senior Network Engineer

Job Type: Full- Time

Workplace Type: Onsite

Clearance: TS/SCI

Must be a U.S. Citizen

Benefits: Medical, dental, and vision coverage, 401k matching, generous PTO, paid holidays, professional training opportunities, and even pet insurance to ensure your furry friends are cared for too.

Job Summary

Castalia Systems is seeking a Senior Network Engineer for a position in Largo, Florida. Due to the applicable duties, this position requires 100% onsite employee status. The Network Engineer position implements network security and information assurance solutions for program and development systems based upon system level requirements, architecture models, and engineering design documents using a defense-in-depth approach on trusted products. This position will involve maintenance, installation, testing, and general support for network infrastructure. The ability and know-how to do basic/advanced troubleshooting, including testing during and after implementation. A solid understating of networking fundamentals is required, and how these fundamental technologies are used in a LAN, MAN or WAN architecture.

Roles and Responsibilities

A qualified candidate will perform the following duties and responsibilities, but are not limited to:

• Configure, administer, and maintain Cisco Unified Communications Manager (CUCM) clusters supporting enterprise and classified environments.
• Manage and maintain Cisco Unity Connection voicemail systems, including user provisioning, call handlers, automated attendants, and voicemail integrations.
• Configure and support dial plans, route patterns, route groups, route lists, SIP trunks, device pools, partitions, and calling search spaces.
• Administer and troubleshoot voice gateways, session border controllers, and VoIP infrastructure.
• Provide Tier III technical support, troubleshooting complex voice, call routing, registration, signaling, and voice quality issues.
• Design, implement, and maintain hunt pilots, hunt lists, line groups, call queuing, and call coverage solutions to optimize call distribution and operational workflows.
• Configure, manage, and support Meet-Me conferencing services, conference bridge resources, and collaboration platforms.
• Plan, coordinate, and execute CUCM and Unity Connection upgrades, patches, and lifecycle management activities.
• Develop upgrade runbooks, rollback procedures, testing plans, and maintenance schedules to ensure successful system implementations.
• Deploy, configure, and integrate UniFi FX solutions within enterprise communications environment.
• Support migration planning, testing, validation, and production cutover activities for voice and collaboration modernization initiatives.
• Implement and maintain DISA Security Technical Implementation Guide (STIG) compliance for Cisco Unified Communications platforms and associated virtual appliances.
• Perform vulnerability remediation, security hardening, compliance validation, and support cybersecurity audits, inspections, and accreditation activities.
• Maintain secure communications environments in accordance with DoD, organizational, and cybersecurity requirements.
• Develop and maintain engineering diagrams, configuration standards, operational procedures, disaster recovery plans, and technical documentation.
• Create, document, and defend system change requests while ensuring configuration management compliance.
• Conduct root cause analysis, incident response activities, and corrective actions to improve system reliability and performance.
• Collaborate with cybersecurity, network, infrastructure, and business stakeholders to implement and support enterprise communication services.
• Gather, analyze, and report system performance metrics to support operational readiness, capacity planning, and continuous improvement initiatives.
• Provide technical guidance and mentorship to junior engineers and support personnel.
• Contribute to strategic modernization efforts and the design, architecture, and enhancement of enterprise voice and collaboration platforms.

Required Qualifications:

• Bachelor's degree and 12 months of relevant professional work experience (excluding internships)
• In absence of a degree, 6 years of relevant experience is required
• Must be able to attain and maintain a DoD 8570 IAT Level II certification (Security+ or CISSP preferred).
• A strong understanding and knowledge of computer, network, and security systems.
• Good interpersonal and communication skills.
• Strong analytical, critical thinking, and problem-solving skills.
• Ability to work well independently under limited oversight, be self-directed and able to prioritize work.

Preferred Qualifications:

• Experience with Juniper SRX, EX series routers and switches.
• Experience deploying security solutions for DoD networks.
• Experience with multi-platforms like Windows, UNIX, LINUX
• Understanding of network engineering fundamentals, including: OSI layers, IP addressing, sub-netting, TCP/IP stack, VLANs, DHCP, etc.
• Willingness to learn new technologies and applications as required.
• Demonstrated experience implementing computer security.
• Ability to adapt both an offensive and defensive mindset to support securing information systems.
• Ability to quickly switch tasks based on changing priorities.
• Strong writing, speaking and interpersonal skills, along with the ability to take initiative and work independently without supervision.
• Ability to work with an extremely risk adverse customer and their policies.

Physical Requirements/Work Environment

• Normal Office environment

Travel

• As needed

Company Description

Castalia Systems is a proven business partner providing mission critical solutions to the Federal Government. We provide cutting edge solutions from Securing and Managing Data to Systems Engineering and Development. Castalia Systems is a pioneer in Artificial Intelligence Design and Application.

With our vast knowledge of our customers' needs and relevant technology, our team is able to bring successful solutions to every mission. We are one-upping our competitors by providing premium IT solutions and platforms with cutting-edge technology so it's so evident when you compare us with anyone.

Disclaimer

Castalia Systems is an equal employment opportunity and affirmative action employer and strives to comply with all applicable laws prohibiting discrimination based on race, color, creed, sex, sexual orientation, age, national origin, or ancestry, physical or mental disability, veteran status, marital status, HIV-positive status, as well as any other category protected by federal, state, or local laws. All such discrimination is unlawful, and all persons involved in the operations of the company are prohibited from engaging in this type of conduct.