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

globalhr; Largo (FL); On-site; USD 87,000 - 165,000; Full time

Benefits offered by this job

Medical, dental, vision insurance

401(k) with company match

Tuition reimbursement

Employee assistance program

Job summary

RTX, a leading aerospace and defense company, is seeking a Senior Cisco Unified Communications Engineer to design, administer, and sustain enterprise voice and collaboration environments. The role focuses on Cisco CUCM, Unity Connection, VOIP infrastructure, SIP, and conferencing, with Tier III technical leadership across upgrades and lifecycle management.

Onsite in Largo, FL, the position requires an active TS/SCI clearance.

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM) with 5+ years of relevant experience, or advanced degree with 3+ years.
• Active and transferable TS/SCI clearance prior to start date.
• DoD 8570 IAT Level II certification (Security+ or CISSP preferred).
• Experience with Cisco CUCM, Unity Connection, SIP, dial plans, voice gateways, SBCs, conferencing.
• Experience securing DoD or regulated environments with DISA STIGs and cybersecurity assessments.
• Experience leading CUCM/Unity upgrades, migrations, and change management.

Responsibilities

• Configure, administer, and maintain CUCM clusters for enterprise and classified environments.
• Manage Unity Connection voicemail systems, user provisioning, and voicemail integrations.
• Configure dial plans, route patterns, SIP trunks, voice gateways, and conferencing.
• Provide Tier III troubleshooting for voice, signaling, and voice quality issues.
• Plan upgrades, patches, and lifecycle management for CUCM and Unity Connection.
• Ensure DISA STIG compliance and cybersecurity hardening across platforms.

Skills

CUCM administration

VoIP engineering

SIP trunking

DISA STIG compliance

DoD security clearance

Education

Bachelor's degree in STEM

Advanced degree in related field

Tools

CUCM

Unity Connection

SBCs

VoIP gateways

Conference platforms

Job description

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 illnessinsurance, 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!

The salary range for this role is 86,800 USD - 165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

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