Hasan Khan

Freelance AI Automation Engineer

Upwork • Freelance

Mar 2024 - Present • 2 yrs 6 mos

Full stack developer and AI automation engineer building production grade systems for clients across the US, EU, and Middle East. Focused on tools that solve real business problems and keep running after handoff, not demos. ✅ n8n and Make workflow automation connecting CRMs, ad platforms, phone systems, and messaging channels, with retries, idempotency, and error alerting built in ✅ AI agents and AI SDR systems for prospect research, outreach, follow up sequencing, and reply handling, with everything logged back to the CRM ✅ AI voice agents using Vapi, ElevenLabs, and Retell for bookings, intake, qualification, and after hours coverage ✅ Twilio SMS and voice systems: IVR menus, call routing, two way SMS, appointment reminders, OTP verification, and A2P 10DLC registration ✅ WhatsApp Business Cloud API with multi number inbox, template approval and fallback, 24 hour window handling, and campaign sending ✅ RAG pipelines and vector search on Supabase pgvector and Pinecone, built on client docs, sites, and PDFs ✅ CRM automation across HubSpot, GoHighLevel, and Keap: lead scoring, lifecycle stages, deal creation, and two way sync ✅ 3CX phone system integration with call journaling, click to call, and screen pop on inbound ✅ Lead pipelines from Meta and LinkedIn Lead Ads, web forms, and booking pages with full UTM attribution ✅ Backend systems in Python, FastAPI, and Celery, deployed on DigitalOcean, Render, and Vercel ✅ Full stack apps and internal dashboards in Next.js, React, and Supabase ✅ Claude Code setup for engineering teams: CLAUDE.md configuration, project rules, subagents, and MCP server integration I build with Claude Code, Cursor, and Codex daily, using Claude, GPT, and Gemini APIs under the hood. AI handles drafting and refactoring, I handle architecture, review, and testing. Every project ships with documentation so the client team owns the system.

Full-stack Developer | AI-Agent Expert

Freelancer - Coming Soon • Tiempo completo

Jan 2024 - Sep 2025 • 1 yr 8 mos

Built and shipped full stack web apps and AI automation systems for clients across Europe, North America and Asia, working remotely as the only technical person on most of them. Designed AI agent systems using LangGraph and RAG pipelines that answer from client documentation instead of guessing, plus voice and chat agents on VAPI, ElevenLabs, Twilio and WhatsApp Business API. Built n8n automations connecting CRMs like Keap and GoHighLevel with lead capture, qualification and follow up, cutting manual work that used to take hours every day. Shipped production sites on Next.js and Supabase with real database design, auth, admin panels the client can run alone, and hosting, DNS and SEO handled end to end. Worked directly with founders on scoping, not just execution. Took vague ideas, turned them into a plan, and delivered something they could actually run without me.

AI Agent Developer | Rehabit

Publicis Poland • Freelance

Jan 2025 - Aug 2025 • 7 mos

I develop intelligent AI agents that can converse with users and provide insightful responses. I use tools like Voiceflow to design the chatbot, Supabase to store and search data, and n8n for automation. Additionally, I use a RAG (Retrieval-Augmented Generation) system with an LLM (Large Language Model) to manage a custom knowledge base. I oversee vector databases, APIs, and an MCP server for backend processing to make sure everything functions properly. My primary goal is to integrate all the components so that the AI provides precise and human-like responses.