Applied · AI System Designsenior

Real-Time Voice Agent

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Utilities

Text Box

Group / Container

Circle

Diamond

Divider Line

Heading

Recommended

Client / User

LLM / Model

STT / TTS

Tool / Function

Working Memory

Observability / Tracing

Human-in-the-Loop

Entry & gateway

Client / User

LLM Gateway

API Gateway

Orchestration

Orchestrator / Planner

Agent / Worker

Agent Loop

Models

LLM / Model

Model Router

Embedding Model

STT / TTS

Retrieval / RAG

Retriever

Reranker

Vector Store

Knowledge Source

Tools & execution

Tool / Function

MCP Server

Code Sandbox

Browser / Computer Env

External API

Memory & state

Working Memory

Long-Term Memory

Cache (semantic/prompt)

Safety & eval

Guardrail / Classifier

PII Filter / Redactor

Eval / Judge

Observability / Tracing

Infra & data

Database / State

Queue / Event Bus

Human

Human-in-the-Loop

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// brief

Real-Time Voice Agent

Design a low-latency speech-to-speech conversational agent with natural turn-taking.

Key Requirements

01Streaming pipeline (VAD → STT → LLM → TTS) with overlap
02Endpointing and barge-in (interruption) handling
03Latency budget engineering (<~800ms to first audio)
04Graceful handling of tool-call latency (no dead air)
05Concurrency scaling and ASR-error recovery

Rubric must-haves

0/2

Has STT/TTS in the pipeline
Has an LLM in the loop

These checks are the structure score, 30% of your total. They update as you draw.

Practise it like the real round

45-minute timer paced through requirements, design and deep dive. The follow-up questions stay hidden until the last phase, and solution hints are off.

AI Review

0/5

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