Telephony Engineer – SDE2

About the role

You will build and operate core pieces of GreyLabs AI’s Telephony platform - the SIP/WebRTC, PSTN/VoIP, and media-handling layer that every voice call in the product passes through. You’ll take features, integrations, and reliability improvements from design through production, working closely with senior engineers who set the platform’s architecture.

What you'll do

• Build and maintain components of the Telephony service - call initiation and termination, session management, SIP/WebRTC handling, PSTN/VoIP integration
• Implement and test integration points between the Telephony platform and the Voice AI layer, including ASR, TTS, and LLM orchestration interfaces
• Support evaluation and integration work with telephony carriers and CPaaS providers - test call flows, load testing, and cutover validation
• Instrument and monitor call quality metrics (latency, jitter, packet loss, MOS scores), and help build dashboards, alerts, and runbooks
• Contribute to failover, redundancy, and disaster-recovery mechanisms for inbound and outbound calling flows, and participate in on-call rotations

What you need

• 3–5 yrs of experience
• Python
• Go
• LLMs
• Performance testing
• Any graduate