Voice of AI

AI Application Engineer

Project Overview

Voice of AI is a production-grade voice calling agent powered by Vapi and Twilio. It handles real-time conversational workflows, call routing, and server-side authentication. Features a Next.js dashboard that displays live call status, transcripts, and post-call summaries streaming from a FastAPI backend.

Challenge & Problem

Businesses need natural, real-time voice interactions without hiring a full call center.

My Role & Deliverables

Sole developer — frontend, backend, and Vapi/Twilio orchestration.

System Architecture & Technologies

Next.js frontend for the dashboard UI. FastAPI backend that integrates Twilio for the actual phone calling and Vapi's API for conversational voice orchestration — the API key is stored server-side, and the backend makes the calls to Vapi rather than exposing it to the client. To start a call, the dashboard sends a POST request with the target phone number to the FastAPI backend, which then calls the Vapi API to initiate it. Once the call is live, call status, a running summary, and the conversation transcript stream into the dashboard in real time.

Result & Project Status

Deployed, production-grade AI voice agent — live call initiation, call summaries, and full conversation logs, all tracked from a custom dashboard.

Technologies Used

Next.jsFastAPIVapiTwilio

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