About the Role

We are building a next-generation cloud telephony and Voice AI platform , similar to Exotel, Plivo, Twilio and Knowlarity .

We are looking for a Principal VoIP & Telephony Infrastructure Engineer to build the core telephony infrastructure powering our platform.

You will own SIP, RTP, FreeSWITCH/Kamailio, SIP trunking, carrier integrations, call routing and real-time audio streaming .

What You'll Work On

- Build and scale carrier-grade SIP/VoIP infrastructure
- Design call routing, SIP trunking and carrier integrations
- Work with FreeSWITCH, Kamailio, OpenSIPS or Asterisk
- Build high-concurrency inbound and outbound calling infrastructure
- Develop real-time RTP/WebSocket audio streaming
- Build infrastructure for virtual numbers, call recording, DTMF, transfers and conferencing
- Optimize latency, reliability, call quality and scalability
- Build integrations with telecom operators and SIP providers
- Work closely with our Voice AI team to connect telephony with AI agents





What We're Looking For
- 5+ years of solid VoIP/telephony experience
- Deep understanding of SIP, RTP, SDP, SIP Trunking and PSTN
- Strong hands-on experience with FreeSWITCH, Kamailio, OpenSIPS or Asterisk
- Experience building high-concurrency production voice systems
- Strong Linux and networking fundamentals
- Experience with Go, C/C++, Python or Node.js
- Experience with telecom carriers/SIP providers is a big plus

Bonus Experience at a CPaaS, cloud telephony, telecom or contact-center company such as Exotel, Plivo, Twilio, Acefone, Ozonetel or Knowlarity.

Location: [Bangalore]

Experience: 5+ years

Type: Full-time

If you have built the infrastructure behind large-scale voice platforms and want to build the next generation of telephony + Voice AI , we'd love to hear from you.

📌 Principal VoIP & Telephony Infrastructure Engineer (Bengaluru)
🏢 GoodBox Ai
📍 Bengaluru