Lead Product Engineer(VoIP)

What You ll Do:

• Implement core voice capabilities using FreeSWITCH, Kamailio/OpenSIPs, and RTPEngine.
• Build and optimize SIP call routing logic, RTP media relays , failover mechanisms, and NAT traversal.
• Develop and manage configurations for scalability, codec negotiation, SIP trunk registration .
• Implement and test features like call recording, IVR, voicemail, DTMF detection.
• Monitor live traffic and participate in 24x7 on-call rotation for critical escalations.
• Collaborate with QA on stress/load testing and with Backend teams on provisioning APIs.
• Document design decisions, configurations, and troubleshooting runbooks.

What Makes You Qualified

• 5 to 9 years of experience building and operating VoIP systems or CPaaS platforms .
• Solid expertise with SIP signaling, RTP, and media relay techniques .
• Strong hands-on with FreeSWITCH, Kamailio/OpenSIPs, RTPEngine .
• Hands-on experience with Session Border Controller (SBC), Media Servers and WebRTC .
• Experience in managing telephony infrastructure for uptime, latency, and call quality optimization.
• Strong systems programming and debugging skills in C/C++ .
• Good scripting/debugging skills ( Bash, Python, or Lua for FreeSWITCH modules ).
• Proficiency with diagnostic tools ( Wireshark, tcpdump etc ).
• Experience working with geographically distributed infrastructure or HA deployments.