Staff SIP Engineer
Staff SIP Engineer responsible for growing, optimizing, and troubleshooting a distributed cloud-based VoIP platform built on Kamailio, FreeSWITCH, and Kubernetes. Requires deep expertise in SIP/RTP protocols, VoIP troubleshooting, and DevOps practices to ensure high reliability and call quality.
About the job
What You Will Own
- Grow and manage a distributed cloud-based VoIP platform
- Optimize and troubleshoot FreeSWITCH and Kamailio configurations for performance, resiliency, and reliability
- Design, build, test, deploy, and maintain services that support the voice platform
- Monitor and analyze VoIP network performance, identify areas for improvement, and implement solutions to enhance quality and efficiency
- Troubleshoot and resolve VoIP-related issues including call quality problems, signaling/connectivity issues, and system outages
- Develop Golang-based microservices and containers that support the voice ecosystem
- Deploy and operate services in Kubernetes environments
- Maintain and configure Kamailio and FreeSWITCH instances
- Implement and improve observability for SIP/RTP flows using HEP/Homer and telemetry (metrics/logs/traces) to accelerate incident response and root-cause analysis
- Partner with SRE/Platform teams to improve CI/CD, infrastructure-as-code, and reliability practices (e.g., automated rollouts, canarying, and repeatable environments)
What You Will Need to Accomplish the Job
- Previous experience working as a VoIP network engineer
- Experience with VoIP applications such as Kamailio, OpenSIPS, FreeSWITCH, RTPengine, and Asterisk
- Experience with troubleshooting tools such as Wireshark, sngrep, and Homer
- Deep understanding of TCP/IP networks, firewalls, and related protocols (SIP, RTP, RTCP, TLS, ICE, STUN, TURN, WebRTC)
- Programming experience with a major language such as Go, Java, or C
- Experience with scripting languages such as Python, Bash, and LUA
- Experience with DevOps tools for cloud infrastructure management and automation such as Terraform and Ansible
- Flexibility and adaptability in learning new technologies and tools
- Strong written, oral, and interpersonal communication skills
- Highly self-motivated and directed
- Keen attention to detail
- Experience operating production services in a major cloud environment (Google Cloud preferred), including networking concepts such as VPCs, load balancing, service discovery, and IAM/security fundamentals
- Comfort participating in on-call rotations and driving incident remediation through postmortems and follow-up engineering work
What Will Make Us Love You
- 5+ years of experience designing and supporting large scale VoIP networks
- Certifications in Kamailio or OpenSIPS
- Hands-on experience with Kubernetes operations (deployments, services/ingress, Helm/Kustomize, autoscaling, and debugging)
- Experience designing or improving call-quality tooling (MOS/RTCP analytics, jitter/loss monitoring, SBC/edge routing strategies, or capacity planning)
Skills
Sip, Rtp, Kamailio, Freeswitch, Rtpengine, Homer, Kubernetes, Go, Terraform, Ansible, Wireshark, Webrtc, GCP
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