Senior VoIP Engineer - RTP / SIP / IVR

We are seeking a Senior VoIP Engineer to design and build high-performance modules within our Voice platform. You'll work on the core telephony stack involving signaling, media processing, NAT traversal, and RTP relaying. This is a hands-on execution role ideal for engineers who love building, debugging, and optimizing real-time communication systems.

Responsibilities :

• 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, and SIP trunk registration.
• Implement and test features like call recording, IVR, voicemail, and DTMF detection.
• Monitor live traffic and participate in a 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.

Requirements :

(ref : hirist.tech)