Hamza Ahmad N.

I build production-ready Voice AI, Twilio and Telnyx systems for SaaS platforms and businesses that need reliable calling, messaging, automation and backend integrations. My recent Upwork projects include building complex Telnyx/Twilio phone systems, AI voice agents, SMS workflows, WebRTC functionality, API integrations and scalable backend infrastructure. What I Can Build • AI Voice Agents & AI Receptionists • Twilio Voice & SMS Systems • Telnyx Voice, SMS & Call Control Integrations • Inbound & Outbound Calling Systems • IVR, Call Routing & Call Forwarding • WebRTC & Browser-Based Calling • SIP & VoIP Integrations • Call Recording, Tracking & Analytics • CRM Calling Integrations • OpenAI / LLM Voice Workflows • Vapi & AI Calling Integrations • Automated SMS & WhatsApp Workflows • Custom REST APIs & Webhooks • SaaS Backend Architecture • n8n, Make & Zapier Automation • CRM & Business System Integrations Backend & Full Stack Development I also build the infrastructure behind these systems using: Node.js | NestJS | Express | Python | FastAPI | React | Next.js | PostgreSQL | MongoDB | Supabase | Redis | AWS | Docker I can handle everything from the frontend dashboard to backend APIs, databases, call infrastructure and third-party integrations. API & Business Integrations I have experience integrating platforms including: Twilio | Telnyx | OpenAI | Stripe | PayPal | QuickBooks | Xero | NetSuite | Salesforce | Shopify | HubSpot | Zoho | Supabase Typical projects include: • Connecting SaaS applications with Twilio or Telnyx • Building AI-powered inbound/outbound calling agents • Creating multi-tenant communication systems • Connecting CRMs with calling and messaging platforms • Automating lead qualification and appointment booking • Building secure API and webhook integrations • Synchronizing data between SaaS, CRM, ERP and accounting systems • Troubleshooting existing voice, SMS and automation systems Why Clients Hire Me ✓ 7+ years of development experience ✓ Strong Twilio/Telnyx and Voice AI experience ✓ Full-stack capability - frontend, backend, APIs and infrastructure ✓ Experience working with complex production systems ✓ Clear communication and consistent progress updates ✓ Strong troubleshooting and problem-solving approach ✓ Focus on reliable, maintainable and scalable solutions If you are building or troubleshooting a Voice AI system, Twilio/Telnyx integration, SaaS backend or business automation, send me the architecture or requirements and I can help you determine the cleanest implementation.