Built for Scale. Designed for Every Vertical.
A deep look at the multi-agent architecture, infrastructure, and AI models powering CallSphere's 6 production platforms.
System Architecture
Every call and chat flows through a multi-layered pipeline — from ingress to triage to specialized agents to your staff dashboard.
Incoming Call / Chat
Voice, WebSocket, REST
Twilio / WebRTC / WebSocket
Telephony & real-time transport
Voice Server
OpenAI Realtime API
Triage Agent
Intent classification & routing
Specialist A
Scheduling
Specialist B
Payments
Specialist C
Support
Function-Calling Tools
CRM, Calendar, Stripe, Custom APIs
PostgreSQL
Primary data
Redis
Cache & queues
ChromaDB
Vector search
Staff Dashboard
React / Next.js
The Full Stack
Every technology in our stack is chosen for production reliability, not hype. Here is what runs across all 6 platforms.
AI & Language Models
OpenAI GPT-4o Realtime API
Sub-second voice responses
OpenAI Agents SDK
Multi-agent orchestration
ElevenLabs
Natural text-to-speech
OpenAI Whisper
Speech-to-text transcription
ChromaDB
Vector database for RAG
Backend Frameworks
Python FastAPI
High-performance async API
Node.js Express
Sales platform backend
NestJS 10 + Prisma
Structured backend services
Go 1.23 Gateway
High-throughput API gateway
Frontend
React 18/19
Component-based UI
Next.js 14/16
Server-side rendering
Tailwind CSS
Utility-first styling
Vite
Fast dev builds
Infrastructure
PostgreSQL
Primary datastore (20-40 tables per product)
Redis
Caching and queues
NATS
Message broker
Twilio
Voice/SMS
AWS SES
Email delivery
K3s Kubernetes
Container orchestration
Docker
Containerization
Multi-Agent Architecture Across Products
Each product has a purpose-built agent topology tuned to its domain. No two are alike.
Healthcare
1 Head Agent- Architecture
- Single agent, 14 tools
- Differentiator
- Dense tool set with post-call analytics
Real Estate
10 Agents- Architecture
- Hierarchical handoffs
- Differentiator
- Vision analysis + financial calculators
Salon & Spa
4 Agents- Architecture
- Intent-based routing
- Differentiator
- Fuzzy matching + upselling
Sales & BDR
5 Agents + Voice- Architecture
- Hybrid (ElevenLabs + GPT)
- Differentiator
- Batch concurrent calling
After-Hours
7 Agents- Architecture
- Pipeline (intake > escalate)
- Differentiator
- Auto-escalation ladders
IT Helpdesk
10 Agents + RAG- Architecture
- Domain specialists
- Differentiator
- ChromaDB knowledge base
Database Scale
115+ database tables across 6 products
Real integrations, not mocks. Every product has its own PostgreSQL schema with foreign keys, migrations, and production data.
Why This Matters for Your Business
Most "AI agent" vendors ship a wrapper around a single LLM call. We ship production systems.
Complete Solutions
Not an API
We don't give you building blocks. You get a complete running solution with database, dashboards, and trained agents from day one.
Engineer-Built
Not a No-Code Builder
Our solutions are built by engineers with real database integrations, not drag-and-drop workflows that break at scale.
Multi-Agent Architecture
Not a Single Agent
Multi-agent architectures with specialized agents mean better accuracy, natural conversations, and graceful handoffs.
See the architecture in action.
Book a technical deep-dive with our engineering team. We will walk you through agent topology, database schemas, and deployment pipelines for your vertical.