H A S A N
Building Intelligent Interfaces.
Full-stack developer specializing in AI agents, voice-first interfaces and production-grade web apps. Six years shipping software that actually gets used.
Recent projects,
shipped in production.
A curated slice of agent infrastructure, SaaS products and tooling I've built for founders and engineering teams over the last two years.
WhatsApp Business Platform with Meta Cloud API
Production-ready WhatsApp Business platform connected to Meta Graph API. Manage verified numbers, send templates and handle real-time conversations from a single admin dashboard.
CRM Automation Dashboard for Marketing Agency
Built a complete inbound CRM for a marketing agency. New leads get auto-notified, labeled, synced and managed across HubSpot, MailerLite and WhatsApp with no human touch required.
Production Web Apps Built with Claude, Cursor, Codex and Lovable
Building production-grade web apps by combining hand-coding with AI tools. React, Next.js, FastAPI, Supabase, RAG pipelines and real API integrations, shipped fast without cutting corners.
HubSpot CRM Automation and Full Ecosystem Integration
Full HubSpot setup and automation covering the entire lead and contact lifecycle. Integrated with 3CX, LinkedIn, Slack and more through n8n to handle everything HubSpot cannot do natively, all running on autopilot.
Meta Ads Lead Automation with AI Enrichment and WhatsApp Alerts
Automated pipeline that captures Meta Ads leads, enriches them with LinkedIn data via Apify, extracts structured contact info and sends a WhatsApp confirmation back to the lead using a custom Meta template.
AI Person and Company Research Agent with Vector Memory
Send a name via Telegram or webhook and the system researches that person across the internet, scrapes their YouTube channel, builds a vector persona in Supabase and spins up a custom AI agent for them, all without touching a single button.
A timeline
of getting better.
Seven years of compounding from first deploy to running agent infrastructure for production teams.
First production app
Shipped Laravel, and React.js, MySql database + Stripe SaaS for a local studio. The bug that started everything.
Integrated AI Into Web Development
Started combining AI tools and models with web development workflows automating tasks, enhancing user experiences, and building smarter web solutions from the ground up.
Went full-time freelance
Left agency work, opened independent practice. Top Rated on Upwork within 9 months.
Full-Stack Mastery
Gained hands-on expertise in React.js, Next.js, Node.js, Django, and Laravel while building scalable and modern web applications
Specialized in AI agents
Shifted focus from generic web work to LangGraph, RAG, LLM, voice agents, and Third Party API Integration. First 6-figure year.
Full-Time AI Agent Engineer
Transitioned fully into AI Agent Engineering designing and deploying production-ready AI agents for international clients, integrating intelligent systems into real-world applications at scale.
100+ projects shipped
Crossed a hundred live deliveries across freelance and contract work; 4.98★ on Upwork and locally.
Building NOVA at scale
Leading agent infrastructure for enterprise clients. Multimodal, voice-first, observability-grade.
Global Expansion
Expand services to enterprise clients worldwide
Engineer, generalist, obsessive shipper.
I'm Hasan, a full-stack developer from Khulna, Bangladesh, working remotely with founders and engineering teams worldwide.
Quick note upfront: I've mentioned being a 4.98 top-rated Upwork freelancer with 100+ projects and 40+ clients. That's true but it was on a previous account I no longer have access to. I'm starting fresh on a new account, and I'd rather prove it through the work than the badge.
I build at the seam between AI agents and production software agentic AI workflows, LangGraph orchestration, RAG pipelines, and Stripe integrations that have to actually hold up under real traffic. The work I'm proudest of is the boring kind: observability, idempotency, the stuff that doesn't break at 2 a.m.
When I'm off the clock, I write about voice agents, tinker with synths, and over-engineer my home network. Always open to a good conversation.
Tools I reach for, daily.
Sharpened on real client work, not tutorials. The list below is honest, only things I'd ship to production tomorrow.
AI & Agents
Backend
Frontend
Tools & DevOps
Numbers that accumulated.
Let's build something.
Best for: AI agent infrastructure, voice products, AI features that aren't shipping, or a senior pair-of-hands for a sprint.