Tech Lead - Telephony
Lead Engineer · Platform Engineering · Bengaluru, Mumbai
About GreyLabs AI
GreyLabs AI is building the voice operating system for India's BFSI. Our Agentic Voice AI platform helps banks, insurers, NBFCs, and fintechs automate and humanise millions of customer conversations - across sales, collections, customer service, and compliance - in multiple Indian languages.
In under two years, we've scaled to 50+ enterprise clients, including RBL Bank, AU Small Finance Bank, IDFC FIRST Bank, SBI Life, ICICI Prudential Life, Motilal Oswal - processing hundreds of millions of conversations. We raised ₹85 Crores in Series A funding led by Elevation Capital with Z47, and were recognised for "Best Use of AI in Fintech" at IFTA 2025.
The Role
You will own the design, development, and ongoing reliability of GreyLabs AI's Telephony platform - the SIP/WebRTC, PSTN/VoIP, and media-handling layer that every voice call in the product passes through. This is a foundational, end-to-end role: architecture, integration contracts with the Voice AI layer,



carrier and CPaaS relationships, call quality, and production operations all fall under your responsibility.
As GreyLabs AI scales, the Telephony service is expected to evolve into a core component of the organisation.
What You'll Do
Technical Ownership
Architect and own the Telephony service end-to-end - call initiation and termination, session management, SIP/WebRTC stack, PSTN/VoIP integration, and media handling
Define and maintain integration contracts between the Telephony platform and the Voice AI layer, including ASR, TTS, and LLM orchestration interfaces
Lead evaluation, selection, and integration of telephony carriers and CPaaS providers (Twilio, Telnyx, Bandwidth, or equivalents), with explicit accountability for cost, reliability, and vendor risk
Own call quality observability - latency, jitter, packet loss, MOS scores - and ensure monitoring, alerting, and incident response tooling are in place from

📌 Tech Lead Mumbai
🏢 GreyLabs AI
📍 Mumbai