Design a Real-Time Voice Agent

Design a voice AI agent that handles real phone calls with low latency — understanding speech, deciding what to say, and responding naturally with proper turn-taking.

StreamingLatencyTurn-takingBarge-inASR/TTSTool Use

Key Requirements

End-to-end latency under 500ms for natural conversation
Handle interruptions and natural turn-taking
Work with background noise and poor audio quality
Gracefully escalate to human agents when stuck
Support multiple languages and accents

Interviewer Follow-ups

Q1How do you handle the user interrupting mid-sentence?
Q2What happens when the speech model misrecognizes a key word?
Q3How do you manage the latency budget across STT, LLM, and TTS?

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