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

Job ID: 01878148Posted: Posted TodayStart Date: 2026-09-28Location: US-FL-LARGO-382SS ~ 7887 Bryan Dairy Rd. ~ BLDG 100Country: United States of AmericaTime Type: Full timeDate 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 1Raytheon Company, Managed by Collins AerospaceAt 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 environmentsManage and maintain Cisco Unity Connection voicemail systems, including user provisioning, call handlers, automated attendants, and voicemail integrationsConfigure and support dial plans, route patterns, route groups, route lists, SIP trunks, device pools, partitions, and calling search spacesAdminister 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 issuesDesign, implement, and maintain hunt pilots, hunt lists, line groups, call queuing, and call coverage solutions to optimize call distribution and operational workflowsConfigure, manage, and support Meet-Me conferencing services, conference bridge resources, and collaboration platformsPlan, coordinate, and execute CUCM and Unity Connection upgrades, patches, and lifecycle management activitiesDevelop upgrade runbooks, rollback procedures, testing plans, and maintenance schedules to ensure successful system implementationsDeploy, configure, and integrate UniFi FX solutions within enterprise communications environment.Support migration planning, testing, validation, and production cutover activities for voice and collaboration modernization initiativesImplement 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 activitiesMaintain 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 documentationCreate, document, and defend system change requests while ensuring configuration management complianceConduct root cause analysis, incident response activities, and corrective actions to improve system reliability and performanceCollaborate with cybersecurity, network, infrastructure, and business stakeholders to implement and support enterprise communication servicesGather, analyze, and report system performance metrics to support operational readiness, capacity planning, and continuous improvement initiativesProvide 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 platformsQualifications 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 experienceActive and transferable U.S. government issued TS/SCI security clearance is required prior to start dateDoD 8570 IAT Level II certification (Security+ or CISSP preferred) and must be maintainedEnterprise voice/collaboration engineering experience, including hands-on administration and engineering of Cisco CUCM in complex environmentsExperience 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 assessmentsExperience leading CUCM/Unity upgrades, migrations, integrations, testing, production cutovers, change management, and technical documentationQualifications We Prefer:Experience with Juniper SRX, EX series routers and switchesExperience deploying security solutions for DoD networksExperience with multi-platforms like Windows, UNIX, LINUXUnderstanding 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 modernizationWhat 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 organization, as well as our engineers – a highly skilled, accomplished network that spans more than 180 sites, 24 countries and 6 Strategic Business Units (SBUs). Our industry-leading experts are setting the standards for the aerospace industry and paving the way for the future. But as new challenges present themselves, we need fresh, creative and motivated minds to overcome these hurdles, help us break barriers and achieve new levels of innovation. Do you have what it takes to join a global organization that doesn’t shy away from big opportunities? If so, we invite you to join our ranks and create the next generation of aerospace technologies. Together, we will nurture an engineering culture that values intellectual curiosity, risk takers and integrity. A place where we will challenge ourselves, our teams, and the status quo and where we will work to find a way – the right way – to achieve what others can only dream of. Please ensure the role type defined below is appropriate for your needs before applying to this role. This position is classified as:Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products.As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.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. Privacy Policy and Terms:Click on this link to read the Policy and Terms