Lead Product Engineer(VoIP)

What You ll Do:

• Implement core voice capabilities usingFreeSWITCH, Kamailio/OpenSIPs, and RTPEngine.
• Build and optimizeSIP call routing logic, RTP media relays, failover mechanisms, andNAT traversal.
• Develop and manage configurations forscalability, 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 ofexperience building and operatingVoIP systems or CPaaS platforms.
• Solid expertise withSIP signaling, RTP, and media relay techniques.
• Strong hands-on withFreeSWITCH, Kamailio/OpenSIPs, RTPEngine.
• Hands-on experience withSession 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 inC/C++.
• Good scripting/debugging skills (Bash, Python, or Lua for FreeSWITCH modules).
• Proficiency with diagnostic tools (Wireshark, tcpdump etc).
• Experience working with geographicallydistributed infrastructure or HA deployments.