Full Stack Web & AI Developer
I build Voice AI agents, real-time conversational systems, and full-stack web applications with the MERN stack, Next.js, and Python FastAPI.
Skills
Frontend
React.js, Next.js, Redux Toolkit, JavaScript (ES6+), TypeScript, Tailwind CSS, Material UI, Bootstrap, HTML5, CSS3
Backend
Node.js, Express.js, FastAPI (Python), RESTful APIs, WebSockets, WebHooks, JWT, OAuth
AI & Voice
OpenAI API, Google Gemini, RAG, Hugging Face, Speech-to-Speech, STT, TTS, Voice AI Agents, Conversational AI
Telephony & Real-time
SIP Trunking, VoIP, Twilio, Nayatel, Inbound/Outbound Calling Flows, Real-time Audio Streaming, Call Routing
Databases
MongoDB, MySQL, PostgreSQL
Cloud & DevOps
AWS (EC2, S3), Render, Vercel, Netlify, Docker, CI/CD, Git, GitHub
Voice Agent Calling Platform
AI-powered voice agent for real-time phone conversations. Inbound & outbound calling via SIP trunking (Twilio, Nayatel), live function calling for conversation logging, and a Next.js admin dashboard for campaign management.
AI Chatbot with RAG
Retrieval-Augmented Generation chatbot delivering accurate, real-time answers from live company data. Production-grade conversational AI integrated with company knowledge bases.
Bus Services CRM
Multi-company bus services platform with route tracking, fare comparison, and an analytics reporting dashboard for operations and management.
Service Marketplace Platform
End-to-end service platform handling orders, quotations, worker & client management, and payments. Includes an admin CRM for managing the entire platform from a single dashboard.
Freelance Marketplace for Physical Tasks
Two-sided platform with task posting, bidding, service orders, dual-role portfolios, real-time messaging, payments, and an admin portal for moderation.
Task Management System
JWT-secured task management platform with real-time updates, advanced filtering, and a clean dashboard interface.
Hi, I'm Hanzla Tahir 👋
I'm a Computer Science graduate from Sukkur IBA University with over a year of professional experience building full-stack web applications, AI-driven systems, and Voice AI agents.
Most recently at Spectrave, I engineered an end-to-end Voice AI Agent for real-time phone conversations — integrating SIP trunking via Twilio and Nayatel, live function calling for conversation logging, and a Next.js admin dashboard for campaign management. Before that, at MarifahSol, I built RAG-powered AI chatbots, multi-company CRMs, and full-fledged service platforms.
I specialize in the MERN stack and Next.js, with strong Python/FastAPI backend experience and hands-on production work with OpenAI, Gemini, real-time audio streaming, and VoIP telephony. I care about writing clean, maintainable code and shipping systems that hold up under real load.
Let's build something ambitious together.
Voice AI Agents & Telephony
End-to-end Voice AI systems for real-time phone conversations. SIP trunking via Twilio or Nayatel, inbound/outbound calling flows, real-time audio streaming, and live function calling for conversation logging.
Conversational AI & RAG Chatbots
Production-grade conversational AI using OpenAI and Gemini. RAG-powered chatbots that answer accurately from your live company data, with function calling and tool integration.
Full-Stack Web Applications
End-to-end web apps with the MERN stack and Next.js. From CRMs and marketplaces to admin dashboards — built with clean architecture, JWT auth, and production-ready deployments.
Backend APIs (Node & Python)
Robust REST and WebSocket APIs with Express.js and FastAPI. Webhook integrations, real-time systems, JWT/OAuth, and Swagger-documented services that scale.
CRM & Admin Dashboards
Internal tooling, multi-tenant CRMs, and analytics dashboards. Route tracking, campaign management, user/role administration, and clean operations interfaces.
Cloud Deployment & CI/CD
Production deployments on AWS (EC2, S3), Vercel, Netlify, and Render. Docker containerization, CI/CD pipelines, and infrastructure that stays running.
Your VoIP Server Won't Get Hacked Overnight. It'll Get Scanned in Minutes.
I put a SIP trunk live at night and woke up unable to make a single call. Nobody hacked me. Here’s what actually happened, how fail2ban saved me, and why it was never the real fix.
Vibe Coding Won’t Replace Engineers But It Might Expose Weak Foundations
Vibe coding is being sold as the future of software. Here's why it's a superpower for non-engineers, a trap for students, and why fundamentals still decide who actually makes it.
Building Voice AI Agents with Twilio, OpenAI, and FastAPI
Lessons from production: how to architect a real-time voice agent that handles inbound and outbound calls, logs conversations live, and scales reliably.
Let's Work Together
Have a project in mind? I'd love to hear about it. Fill out the form and I'll get back to you as soon as possible.
- Phone+92 304 5296171
- LocationIslamabad, Pakistan
Send a Message
I'll respond within 24 hours