Liberty Mutual Insurance
Principal Network Engineer — Cloud-Native Voice / Ribbon SIP
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. This hands‑on role combines deep SIP/VoIP networking knowledge with Kubernetes, automation, CI/CD and DevOps software engineering skills. You will set technical direction, build production‑ready systems, and partner with software, SRE and product teams to deliver a scalable, observable and secure voice platform.
Responsibilities
Contribute to architectural patterns and implementation of SIP signaling and media infrastructure based on Ribbon SIP solutions (SBCs, proxies, session management).
Design and build a cloud‑native voice platform to run SIP control‑plane and media‑plane components on Kubernetes (EKS/GKE/AKS), focusing on scale, low latency and resiliency.
Implement DevOps via CI/CD and deployment pipelines for containerised voice services (Git‑based workflows, automated builds, testing, and progressive deployments).
Automate infrastructure and operational processes using IaC and configuration management (Terraform/CloudFormation, Ansible, Helm).
Design and implement containerisation, service discovery, networking, and traffic routing for real‑time voice (Multus/CNI, SR‑IOV, QoS, service mesh as appropriate).
Build and maintain robust monitoring, alerting and observability for SIP and media metrics (Prometheus/Grafana, ELK, RTCP, SIP traces, distributed tracing).
Ensure security and compliance for voice traffic (TLS/SRTP, SBC security policies, firewalling, encryption, role‑based access) to meet/exceed industry standards such as PCI, NYDFS, and evolving practices.
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; participate in on‑call rotations as needed.
Mentor engineers, establish best practices and standards, conduct peer reviews, and collaborate with product, SRE and software teams.
Required Qualifications
8+ years designing, implementing and operating SIP/VoIP networks and systems, with demonstrable experience working with Ribbon SIP telephony products.
Strong hands‑on experience with Kubernetes (production clusters, operators/CRDs, networking, security and scaling).
Practical experience with CI/CD pipelines and deployment automation (Jenkins, GitLab CI, ArgoCD, Tekton or equivalent).
Proficient software engineering skills – coding and scripting (Python, Go, or similar), writing automated tests and production‑quality automation.
Proven experience with infrastructure‑as‑code tooling (Terraform, CloudFormation) and container packaging (Docker, Helm).
Deep understanding of RTP/SRTP, SIP signaling (REGISTER/INVITE/PRACK/etc.), media handling, NAT traversal, and SBC behavior.
Experience with cloud providers and managed Kubernetes (AWS/GCP/Azure) and cloud‑native managed services.
Strong knowledge of networking (TCP/UDP, QoS, UDP load balancing, BGP, routing) and security best practices for real‑time communications.
Excellent troubleshooting skills for high‑volume, low‑latency systems and experience operating in a 24x7 production environment.
Preferred Qualifications
Prior experience building high‑scale cloud‑native voice platforms (SaaS voice, CPaaS or telco‑grade platforms).
Significant experience with Ribbon product line (SBC/PSX/RAMP/Analytics) and associated management/orchestration APIs.
Experience with voice testing and load tools (SIPp, Hammer, PJSIP) and call‑quality measurement tools (MOS, R‑factor).
Knowledge of observability tools (Prometheus, Grafana, Jaeger, ELK) and call trace analysis.
Cloud and networking certifications (CCNP/CCIE, AWS/GCP/Azure certified) or Ribbon vendor certification.
Experience with service mesh, eBPF or advanced Kubernetes network plugins for media acceleration.
Key Competencies
Strong system‑design abilities with a bias for automation and repeatability.
Clear communicator capable of translating technical trade‑offs to stakeholders and mentoring teams.
Proven track record delivering production systems end‑to‑end: design, build, deploy, operate and improve.
Comfortable working in cross‑functional Agile teams and driving engineering excellence.
Location & Salary Columbus, OH – $129,500.00 – $194,300.00 (pay range)
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Information Technology
Industry Insurance
Benefits & Compensation Pay philosophy: Salary reflects the competitive labor market value for all employees in this role and provides an opportunity for progress as employees grow. Some roles may include commission and/or bonus earnings.
Equal Opportunity Employer 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.
Fair Chance Notices
California
Los Angeles Incorporated
Los Angeles Unincorporated
Philadelphia
San Francisco
#J-18808-Ljbffr
Responsibilities
Contribute to architectural patterns and implementation of SIP signaling and media infrastructure based on Ribbon SIP solutions (SBCs, proxies, session management).
Design and build a cloud‑native voice platform to run SIP control‑plane and media‑plane components on Kubernetes (EKS/GKE/AKS), focusing on scale, low latency and resiliency.
Implement DevOps via CI/CD and deployment pipelines for containerised voice services (Git‑based workflows, automated builds, testing, and progressive deployments).
Automate infrastructure and operational processes using IaC and configuration management (Terraform/CloudFormation, Ansible, Helm).
Design and implement containerisation, service discovery, networking, and traffic routing for real‑time voice (Multus/CNI, SR‑IOV, QoS, service mesh as appropriate).
Build and maintain robust monitoring, alerting and observability for SIP and media metrics (Prometheus/Grafana, ELK, RTCP, SIP traces, distributed tracing).
Ensure security and compliance for voice traffic (TLS/SRTP, SBC security policies, firewalling, encryption, role‑based access) to meet/exceed industry standards such as PCI, NYDFS, and evolving practices.
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; participate in on‑call rotations as needed.
Mentor engineers, establish best practices and standards, conduct peer reviews, and collaborate with product, SRE and software teams.
Required Qualifications
8+ years designing, implementing and operating SIP/VoIP networks and systems, with demonstrable experience working with Ribbon SIP telephony products.
Strong hands‑on experience with Kubernetes (production clusters, operators/CRDs, networking, security and scaling).
Practical experience with CI/CD pipelines and deployment automation (Jenkins, GitLab CI, ArgoCD, Tekton or equivalent).
Proficient software engineering skills – coding and scripting (Python, Go, or similar), writing automated tests and production‑quality automation.
Proven experience with infrastructure‑as‑code tooling (Terraform, CloudFormation) and container packaging (Docker, Helm).
Deep understanding of RTP/SRTP, SIP signaling (REGISTER/INVITE/PRACK/etc.), media handling, NAT traversal, and SBC behavior.
Experience with cloud providers and managed Kubernetes (AWS/GCP/Azure) and cloud‑native managed services.
Strong knowledge of networking (TCP/UDP, QoS, UDP load balancing, BGP, routing) and security best practices for real‑time communications.
Excellent troubleshooting skills for high‑volume, low‑latency systems and experience operating in a 24x7 production environment.
Preferred Qualifications
Prior experience building high‑scale cloud‑native voice platforms (SaaS voice, CPaaS or telco‑grade platforms).
Significant experience with Ribbon product line (SBC/PSX/RAMP/Analytics) and associated management/orchestration APIs.
Experience with voice testing and load tools (SIPp, Hammer, PJSIP) and call‑quality measurement tools (MOS, R‑factor).
Knowledge of observability tools (Prometheus, Grafana, Jaeger, ELK) and call trace analysis.
Cloud and networking certifications (CCNP/CCIE, AWS/GCP/Azure certified) or Ribbon vendor certification.
Experience with service mesh, eBPF or advanced Kubernetes network plugins for media acceleration.
Key Competencies
Strong system‑design abilities with a bias for automation and repeatability.
Clear communicator capable of translating technical trade‑offs to stakeholders and mentoring teams.
Proven track record delivering production systems end‑to‑end: design, build, deploy, operate and improve.
Comfortable working in cross‑functional Agile teams and driving engineering excellence.
Location & Salary Columbus, OH – $129,500.00 – $194,300.00 (pay range)
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Information Technology
Industry Insurance
Benefits & Compensation Pay philosophy: Salary reflects the competitive labor market value for all employees in this role and provides an opportunity for progress as employees grow. Some roles may include commission and/or bonus earnings.
Equal Opportunity Employer 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.
Fair Chance Notices
California
Los Angeles Incorporated
Los Angeles Unincorporated
Philadelphia
San Francisco
#J-18808-Ljbffr