Sr. Engineer, Cyber Call Manager - CUCM (Onsite - Largo, FL) TS/SCI clearance required

Date Posted:

2026-09-28

 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

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.

Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense.

The organization is seeking a Senior Cisco Unified Communications Engineer to design, administer, and sustain enterprise and classified voice and collaboration environments, with primary responsibility for Cisco CUCM, Unity Connection, VoIP infrastructure, voice gateways, SIP, conferencing, and associated collaboration platforms. The role will provide Tier III technical leadership across system engineering, troubleshooting, upgrades, modernization, and lifecycle management while ensuring DISA STIG compliance, cybersecurity hardening, configuration management, and accreditation requirements are met.

This role will be worked onsite in Largo, FL and requires an active TS/SCI clearance. Relocation assistance is available.

What You Will Do:

• •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

Qualifications You Must Have:

• •Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 5 years of prior relevant experience, or an Advanced Degree in a related field and a minimum of 3 years of experience
• •Active and transferable U.S. government issued TS/SCI security clearance is required prior to start date
• •DoD 8570 IAT Level II certification (Security+ or CISSP preferred) and must be maintained
• •Enterprise voice/collaboration engineering experience, including hands-on administration and engineering of Cisco CUCM in complex environments
• •Experience with CUCM, Unity Connection, SIP, dial plans, voice gateways, SBCs, conferencing, and Tier III troubleshooting.
• •Experience securing DoD or regulated environments, including DISA STIGs, vulnerability remediation, security hardening, compliance, and cybersecurity assessments
• •Experience leading CUCM/Unity upgrades, migrations, integrations, testing, production cutovers, change management, and technical documentation

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, LINUX
• •Understanding of network engineering fundamentals, including: OSI layers, IP addressing, sub-netting, TCP/IP stack, VLANs, DHCP, etc.
• •CCNP Collaboration or equivalent hands-on expertise preferred, with demonstrated ability to lead technical initiatives, mentor engineers, and support enterprise voice modernization

What We Offer:

Some of our competitive benefits package includes:

• •Medical, dental, and vision insurance
• •Three weeks of vacation for newly hired employees
• •Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option
• •Tuition reimbursement program
• •Student Loan Repayment Program
• •Life insurance and disability coverage
• •Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection
• •Birth, adoption, parental leave benefits
• •Carrot Health, fertility, and family planning
• •Adoption Assistance
• •Autism Benefit
• •Employee Assistance Plan, including up to 10 free counseling sessions
• •Healthy You Incentives, wellness rewards program
• •Doctor on Demand, virtual doctor visits
• •Bright Horizons, child and elder care services
• •Teladoc Medical Experts, second opinion program
• •And more!

Learn More & Apply Now!

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 makes modern flight possible. Of course, that wouldn’t be possible without the capabilities and technologies of our