Liberty Mutual Insurance
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Principal Network Engineer
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Liberty Mutual Insurance Job title: Principal Network Engineer — Cloud-Native Voice / Ribbon SIP Role summary: We are seeking a Principal Network Engineer to own the design, deployment and lifecycle of our Ribbon-based SIP telephony infrastructure and contribute to the definition of the architecture and build-out of a cloud native platform for carrier-grade voice traffic. Responsibilities
Contribute to architectural patterns and implementation of SIP signaling and media infrastructure based on Ribbon SIP solutions. Design and build a cloud-native voice platform to run SIP control-plane and media-plane components on Kubernetes. DevOps implementation via CI/CD and deployment pipelines for containerized voice services. Automate infrastructure and operational processes using IaC and configuration management. Design and implement containerization, service discovery, networking, and traffic routing for real-time voice. Build and maintain robust monitoring, alerting and observability for SIP and media metrics. Ensure security and compliance for voice traffic to meet/exceed established industry standards. Define and drive SLOs/SLAs, capacity planning, performance testing and call-quality monitoring. Create and maintain runbooks, playbooks and support automation for incident response and DR scenarios. Mentor engineers, establish best practices and standards, conduct peer reviews with architecture and collaborate with product, SRE and software teams. Required Qualifications
8+ years designing, implementing and operating SIP/VoIP networks and systems. Strong hands-on experience with Kubernetes. Practical experience with CI/CD pipelines and deployment automation. Proficient software engineering skills - experience coding and scripting. Proven experience with infrastructure-as-code tooling and container packaging. Deep understanding of RTP/SRTP, SIP signaling, media handling, NAT traversal, and SBC behavior. Experience with cloud providers and managed Kubernetes. Strong knowledge of networking and security best practices for real-time communications. Excellent troubleshooting skills for high-volume, low-latency systems. Preferred Qualifications
Prior experience building high-scale cloud-native voice platforms. Significant experience with Ribbon product line and associated management/orchestration APIs. Experience with voice testing and load tools and call-quality measurement tools. Knowledge of observability tools and call trace analysis. Cloud and networking certifications or Ribbon vendor certification. Experience with service mesh, eBPF or advanced Kubernetes network plugins for media acceleration. We are dedicated to fostering an inclusive environment where employees from all backgrounds can build long and meaningful careers. Liberty Mutual is an equal opportunity employer. We will not tolerate discrimination on the basis of race, color, national origin, sex, sexual orientation, gender identity, religion, age, disability, veteran's status, pregnancy, genetic information or on any basis prohibited by federal, state or local law.
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Principal Network Engineer
role at
Liberty Mutual Insurance Job title: Principal Network Engineer — Cloud-Native Voice / Ribbon SIP Role summary: We are seeking a Principal Network Engineer to own the design, deployment and lifecycle of our Ribbon-based SIP telephony infrastructure and contribute to the definition of the architecture and build-out of a cloud native platform for carrier-grade voice traffic. Responsibilities
Contribute to architectural patterns and implementation of SIP signaling and media infrastructure based on Ribbon SIP solutions. Design and build a cloud-native voice platform to run SIP control-plane and media-plane components on Kubernetes. DevOps implementation via CI/CD and deployment pipelines for containerized voice services. Automate infrastructure and operational processes using IaC and configuration management. Design and implement containerization, service discovery, networking, and traffic routing for real-time voice. Build and maintain robust monitoring, alerting and observability for SIP and media metrics. Ensure security and compliance for voice traffic to meet/exceed established industry standards. Define and drive SLOs/SLAs, capacity planning, performance testing and call-quality monitoring. Create and maintain runbooks, playbooks and support automation for incident response and DR scenarios. Mentor engineers, establish best practices and standards, conduct peer reviews with architecture and collaborate with product, SRE and software teams. Required Qualifications
8+ years designing, implementing and operating SIP/VoIP networks and systems. Strong hands-on experience with Kubernetes. Practical experience with CI/CD pipelines and deployment automation. Proficient software engineering skills - experience coding and scripting. Proven experience with infrastructure-as-code tooling and container packaging. Deep understanding of RTP/SRTP, SIP signaling, media handling, NAT traversal, and SBC behavior. Experience with cloud providers and managed Kubernetes. Strong knowledge of networking and security best practices for real-time communications. Excellent troubleshooting skills for high-volume, low-latency systems. Preferred Qualifications
Prior experience building high-scale cloud-native voice platforms. Significant experience with Ribbon product line and associated management/orchestration APIs. Experience with voice testing and load tools and call-quality measurement tools. Knowledge of observability tools and call trace analysis. Cloud and networking certifications or Ribbon vendor certification. Experience with service mesh, eBPF or advanced Kubernetes network plugins for media acceleration. We are dedicated to fostering an inclusive environment where employees from all backgrounds can build long and meaningful careers. Liberty Mutual is an equal opportunity employer. We will not tolerate discrimination on the basis of race, color, national origin, sex, sexual orientation, gender identity, religion, age, disability, veteran's status, pregnancy, genetic information or on any basis prohibited by federal, state or local law.
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