Principal CUCM Engineer (Onsite)

Job description

Date Posted: 2026-08-26 Country: United States of America Location: US-FL-LARGO-382SS ~ 7887 Bryan Dairy Rd. ~ BLDG 100 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date.​ U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance​ Security Clearance Type: TS/SCI - Current Security Clearance Status: Active and existing security clearance required on day 1 Raytheon Company, Managed By Collins Aerospace. Collins Aerospace, an RTX company, is a leader in technologically advanced and intelligent solutions for the global aerospace and defense industry. Collins Aerospace has the capabilities, comprehensive portfolio, and expertise to solve customers’ toughest challenges and to meet the demands of a rapidly evolving global market. Collins Aerospace is seeking a Cisco Unified Communications Manager (CUCM) for a position in Largo, Florida. Sign On Bonus Eligible What You Will Do​Architect, engineer, administer, and maintain highly available Cisco Unified Communications Manager (CUCM) clusters supporting large-scale enterprise, mission-critical, and classified environments.Serve as a senior technical authority for Cisco Unified Communications (UC) environments, providing architectural direction, engineering guidance, and technical leadership across voice and collaboration services.Design, implement, optimize, and troubleshoot complex CUCM dial plans, including route patterns, route groups, route lists, SIP trunks, device pools, partitions, calling search spaces, translation patterns, and advanced call-routing solutions.Engineer and maintain Cisco Unity Connection environments, including enterprise voicemail architectures, user provisioning, call handlers, automated attendants, integrations, redundancy, and complex troubleshooting.Design, administer, and troubleshoot voice gateways, session border controllers (SBCs), SIP infrastructure, and associated VoIP services across geographically distributed environments.Lead Tier III/IV troubleshooting and root cause analysis for complex voice and collaboration incidents involving call routing, SIP signaling, registration, interoperability, latency, packet loss, jitter, codec negotiation, voice quality, and service availability.Design and implement advanced call-distribution solutions, including hunt pilots, hunt lists, line groups, call queuing, call coverage, automated routing, and resiliency mechanisms aligned with operational requirements.Architect and support Meet-Me conferencing, conference bridge resources, collaboration services, and integrations with enterprise communication platforms.Lead the planning, engineering, coordination, and execution of CUCM and Unity Connection upgrades, migrations, patches, version transitions, and lifecycle management activities with minimal operational disruption.Develop and approve comprehensive upgrade and implementation strategies, including engineering plans, test procedures, rollback strategies, risk assessments, maintenance windows, validation criteria, and operational acceptance plans.Lead voice and collaboration modernization initiatives from requirements analysis and solution architecture through laboratory validation, migration planning, production implementation, and post-cutover stabilization.Architect and implement DISA Security Technical Implementation Guide (STIG) compliance across Cisco Unified Communications platforms, associated virtual appliances, and supporting infrastructure.Evaluate security findings and determine technically sound remediation strategies while balancing cybersecurity requirements, system availability, mission impact, and operational constraints.Engineer and maintain secure communications architectures in accordance with DoD, organizational, RMF, cybersecurity, and classified-environment requirements.Develop and maintain authoritative engineering documentation, including high-level and low-level designs, network and call-flow diagrams, configuration standards, technical baselines, operational procedures, disaster recovery plans, continuity strategies, and system security documentation.Establish and enforce configuration management practices, technical baselines, engineering standards, and change-control processes for enterprise voice and collaboration platforms.Provide technical leadership and mentorship to P3/P2 engineers and support personnel, including design reviews, troubleshooting guidance, knowledge transfer, and development of engineering standards and best practices.Qualifications You Must Have • A strong understanding and knowledge of computer, network, and security systems. • Good interpersonal and communication skills, strong analytical, critical thinking, and problem-solving skills, and the ability to work well independently under limited oversight, be self-directed and able to prioritize work. • Active and transferable Top Secret U.S. government issued security clearance with SCI eligibility is required prior to start date. • Must be able to attain and maintain a DoD 8570 IAT Level II certification (Security+ or CISSP preferred). • Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 8 years prior relevant experience or an Advanced Degree in a related field and minimum 5 years of experience. Qualifications We Prefer​Experience with Juniper SRX, EX series routers and switches.Experience deploying security solutions for DoD networks.Experience with multi-platforms like Windows, UNIX, LINUXUnderstanding 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.What We Offer​Medical, dental, and vision insurance. ​Three weeks of vacation for newly hired employees. ​Generous 401(k) plan that includes employer matching funds and separate