Hassan Ali
Callback OS

Callback OS
Building

Completed May 2026

AIVoice AITwilioAutomationSaaS
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Overview

Callback OS is an AI-powered lead recovery system designed for high-intent service businesses (Lawyers, Dentists, Real Estate). When a call is missed, the system immediately triggers an AI-driven callback to qualify the lead and book an appointment, ensuring that no revenue-generating opportunity is ever lost.

Features

  • Instant AI Callback — Responds to missed calls in under 30 seconds
  • Voice AI Qualification — Natural language conversations to qualify leads
  • CRM Integration — Automatically syncs lead data to Salesforce, HubSpot, or GoHighLevel
  • Appointment Booking — Directly integrates with Google Calendar or Calendly
  • Human Handoff — Seamlessly transfers “hot” leads to a live agent when necessary

Technologies Used

  • Twilio — Programmable Voice and SMS infrastructure
  • ElevenLabs — High-fidelity voice synthesis
  • Vapi / OpenAI — Real-time conversational AI models
  • FastAPI — Orchestration layer and webhooks
  • Next.js — Business owner dashboard
  • Pinecone — Vector database for business-specific knowledge retrieval (RAG)

How It Works

  1. Webhook Trigger — Detects missed call event from the telephony provider
  2. AI Initialization — Instantiates a conversation agent with business context
  3. Outbound Dialing — Places a call back to the prospect
  4. Intelligent Dialogue — Agent qualifies the prospect’s needs and intent
  5. Action Execution — Books meeting or captures lead info into the CRM

Challenges & Learnings

Current Focus: Minimizing latency in voice responses to maintain a natural conversation flow.

Solution: Leveraging edge-deployed LLMs and optimized streaming protocols to keep response times under 800ms.

Built with ❤️ by Hassan Ali