Senior Lead – VOIP Engineer
Core
Design and implement carrier-grade VOIP infrastructure for a CCaaS platform, ensuring high availability, low latency, and global scalability for mission-critical voice communication.
Role type
Senior Lead VOIP Engineer (Hands-on IC with leadership)
Builds
Carrier-grade voice infrastructure, session border controllers, and call analytics APIs for a Unified-CXM platform.
Domain
Telecommunications / VoIP / Cloud Contact Center as a Service (CCaaS)
Deliverable
production ML models | infrastructure
Required skills
C/C++ systems programming, SIP/SDP/RTP/RTCP protocols, FreeSWITCH/Kamailio/OpenSIPS/RTPEngine, Session Border Controller (SBC) architecture, NAT traversal (ICE/STUN/TURN), VoIP security (TLS/SRTP), distributed systems design, cloud deployment (AWS/GCP/Azure), network monitoring and debugging.
Preferred skills
Experience with carrier-grade telephony platforms serving millions of calls, WebRTC, fraud prevention, audio quality optimization (codecs, jitter, packet loss).
Technologies
FreeSWITCH, Kamailio, OpenSIPS, RTPEngine, SIP, SDP, RTP, RTCP, ICE, STUN, TURN, TLS, SRTP, AWS, GCP, Azure, C, C++
Responsibilities
Design and implement VOIP signaling and media infrastructure; Architect session border controllers, NAT traversal, load balancing, and failover strategies; Define standards for call routing and audio quality optimization; Lead initiatives for scalability, observability, security, and resiliency; Troubleshoot live traffic and provide technical leadership during major incidents; Collaborate with Backend and API teams to design provisioning, billing, and call analytics APIs; Coach and mentor junior/lead engineers in VoIP best practices.
Seniority
Senior, hands-on IC with leadership responsibilities