Principal CUCM Engineer (Onsite)

Job ID: 01869447Posted: Posted YesterdayStart Date: 2026-08-26Location: US-FL-LARGO-382SS ~ 7887 Bryan Dairy Rd. ~ BLDG 100Country: United States of AmericaTime Type: Full timeDate 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 1Raytheon 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 EligibleWhat 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 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. ​Ovia 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. ​May be eligible for relocation.And more!  ​Learn More & Apply Now!​Do you want to be a part of something bigger? A team whose impact stretches across the world, and even beyond? At Collins Aerospace, our Mission Systems team helps civilian, military and government customers complete their most complex missions — whatever and wherever they may be. Our customers depend on us for intelligent and secure communications, missionized systems for specialized aircraft and spacecraft and collaborative space solutions. By joining our team, you’ll have your own critical part to play in ensuring our customers succeed today while anticipating their needs for tomorrow. Are you up for the challenge? Join our mission today. ​*Please ensure the role type (defined below) is appropriate for your needs before applying to this role. ​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. ​At Collins, the paths we pave together lead to limitless possibilities. And the bonds we form – with our customers and with each other -- propel us all higher, again and again. ​ ​Apply now and be part of the team that’s redefining aerospace, every day. 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 107,500 USD - 204,500 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