Retell AI
Twilio
Cartesia
ElevenLabs
WhatsApp Business API
Telegram Bot API
Instagram DM
Function calling / Tool use
RAG
OpenAI (GPT-4.1)
Anthropic (Claude)
Claude Code
Node.js
Laravel
Ruby on Rails
Next.js
React / TypeScript
PostgreSQL
Firestore
Prisma
n8n
Zapier
Make
Stripe
Cal.com API
VPS Linux
Nginx
Google Analytics 4