Leidos is seeking a Principal Enterprise Voice Engineer to lead engineering, sustainment, maintenance, and operational support of enterprise IP voice and video communications. This position requires extensive experience with enterprise unified communications, SIP signaling, call routing, network infrastructure, cybersecurity, and voice service interoperability. The engineer will collaborate with network, cybersecurity, systems engineering, and operations teams to ensure secure, reliable, and uninterrupted voice services. The engineer will provide technical direction, review engineering designs and change packages, resolve complex escalations, and mentor less-experienced engineers. This is a senior technical position without formal supervisory responsibilities. Primary Responsibilities Enterprise Voice Architecture and Engineering Serve as the senior technical authority for enterprise IP voice and video infrastructure. Lead the design, engineering, modernization, and technical implementation of Cisco, Avaya, Oracle, and associated voice technologies. Establish engineering standards, architecture requirements, configuration baselines, and technical implementation strategies. Review and approve complex engineering designs, system configurations, and technical solutions to ensure performance, security, scalability, and resiliency. Evaluate emerging technologies and provide modernization, lifecycle management, and capacity planning recommendations. Enterprise Networking and Voice Integration Provide technical leadership for integrating enterprise voice services across routing, switching, WAN, firewall, and security infrastructure. Direct engineering solutions involving SIP signaling, media services, call routing, carrier interconnections, and multi-vendor interoperability. Lead technical assessments of IPsec, MPLS VPN, BGP, and QoS implementations supporting enterprise voice services. Collaborate with network and cybersecurity engineering teams to resolve complex infrastructure dependencies and security requirements. Advanced Troubleshooting and Operational Support Serve as the highest-level technical escalation point for complex voice service incidents and engineering challenges. Lead advanced troubleshooting and root-cause analysis involving SIP signaling, call flows, media paths, routing, and network security. Direct corrective actions for major incidents, recurring problems, and systemic service reliability issues. Provide technical oversight for system maintenance, upgrades, capacity planning, and configuration management activities. Problem and Change Management Provide technical authority for reviewing and approving engineering changes, implementation strategies, and rollback procedures. Assess architectural risks, operational impacts, and service dependencies associated with enterprise voice infrastructure changes. Lead technical investigations and engineering improvements through established Problem and Change Management processes. Coordinate complex implementations and technical resolutions across engineering teams, operations, and customer stakeholders. Technical Leadership and Documentation Provide technical direction and engineering oversight for assigned projects, initiatives, and complex technical workstreams. Establish and maintain enterprise voice engineering standards, architecture documentation, SOPs, and technical procedures. Review engineering deliverables and mentor less-experienced engineers through design reviews, troubleshooting, and knowledge transfer. Advise program leadership and government customers on technical risks, infrastructure improvements, and modernization strategies. Required Qualifications: Bachelor's degree or equivalent experience and 12+ years of prior relevant experience, or Master's degree with 10+ years of experience. Specific experience, education, and training may be considered in lieu of a degree. Current IAT Level II or higher certification, such as Security+ or CISSP. Active DoD Secret clearance. Preferred Qualifications Advanced experience engineering and supporting Cisco Unified Communications Manager (CUCM), Avaya Aura, Oracle Session Border Controllers (SBCs), and enterprise voice gateway technologies. Demonstrated expertise in SIP signaling, call routing, multi-vendor interoperability, and SBC-to-carrier interconnections. Strong knowledge of Secure Real-Time Transport Protocol (SRTP), G.711/G.729 codecs, and Dual-Tone Multi-Frequency (DTMF) signaling. Experience designing and engineering distributed firewall infrastructure supporting secure enterprise voice communications. Advanced experience designing, implementing, and troubleshooting IPsec, MPLS VPN, and BGP routing infrastructure. Experience architecting and optimizing end-to-end Quality of Service (QoS), including traffic classification, marking, queuing, and prioritization for voice and mission-critical applications. Experience evaluating network security, routing, and transport architectures to ensure voice service availability, performance, and resiliency. Experience leading complex engineering initiatives, technical design reviews, and enterprise voice modernization efforts. Experience supporting medium and large scale enterprise voice environments. Experience providing technical guidance, engineering oversight, and mentoring to multidisciplinary engineering teams. Key Success Factors The ideal candidate is a senior technical authority capable of leading enterprise voice engineering initiatives across complex, geographically distributed DoD environments. The successful engineer will demonstrate advanced expertise in voice architecture, SIP signaling, network integration, and complex troubleshooting while providing technical direction, evaluating engineering risks, and driving improvements in service reliability and resiliency. Success requires the ability to make sound technical decisions, resolve challenges beyond the capabilities of less-experienced engineers, and guide enterprise voice modernization without formal supervisory responsibilities. If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares. Original Posting: October 15, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range: Pay Range $116,350.00 - $210,325.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law. Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com. Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to spam.leidos@leidos.com. Commitment and Diversity All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

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