Hassan B.

Top Rated Plus engineer. Top 1% on Upwork, 100% Job Success. I build production-grade SaaS web apps, mobile apps, AI chatbots, and AI agents — end to end. Senior engineer with 8+ years of experience; I've shipped products solo and led small teams when the project needed it. Most projects are a mix — AI integration, chatbot work, and full-stack web/mobile builds, often all at once. WHAT I BUILD ▸ AI-powered SaaS platforms Multi-tenant SaaS in Next.js + Postgres/Supabase + Stripe. Auth, billing, dashboards, admin panels. MVP in 2–6 weeks; ongoing for production. Full-stack development, end to end. ▸ Mobile apps with AI React Native + Expo cross-platform. Native iOS/Android when needed. Push, offline sync, deeplinks, subscriptions. AI features integrated cleanly (chat, voice, RAG, OCR). ▸ AI chatbots & RAG systems Custom chatbot development with Claude (Anthropic) or GPT, trained on your docs, PDFs, CRM. Vector search (Pinecone or Supabase pgvector). Citation-backed answers. Delivered on web, WhatsApp, or Slack. ▸ AI agents & automation Multi-step AI agents with LangChain / LangGraph + MCP tool servers. Document processing, lead qualification, research, internal-ops automation. Hooked into Make, n8n, Zapier — automation expert across the major no-code platforms. ▸ AI integration into existing apps Drop Claude, GPT, or Gemini into the app you already have. Connect AI to your existing CRM, dashboards, and tools. The most common project type — fast retrofit, clear ROI. ▸ Voice & calling agents Vapi, Retell, Bland, ElevenLabs, Deepgram, Twilio, LiveKit. Sub-200ms inbound/outbound, CRM dispositioning, appointment booking. Built when the project calls for it. ▸ Chrome extensions & internal tools Manifest V3 extensions, scraping/automation tools, admin dashboards. ▸ Vibe-code cleanup & deployment Lovable, Bolt, Replit, Cursor projects that need real engineering: production refactor, security, deploy pipeline, debugging, scaling. DEFAULT STACK Frontend: Next.js, React, React Native, TypeScript, Tailwind Backend: Node.js, Python (FastAPI), Postgres, Supabase, MongoDB, Redis AI: Claude (Sonnet/Opus), GPT-4o/5, Gemini, LangChain, LangGraph, MCP servers, Pinecone, Supabase pgvector Voice: Vapi, Retell, Bland AI, ElevenLabs, Deepgram, Twilio, LiveKit Mobile: React Native, Expo, native iOS/Android Infra: AWS, Vercel, Cloudflare, Docker, GitHub Actions Integrations: Stripe, Twilio, SendGrid, WhatsApp Business API, GoHighLevel, HubSpot, Salesforce RECENT REAL DEPLOYMENTS (anonymized for NDA) • Multi-agent recruitment platform — 5 specialized agents, LangGraph orchestrator, Stripe billing. • Healthcare RAG — medical report drafter, citation-backed answers, cut documentation time 90%. • Real-estate voice agent — Vapi + GHL + Twilio. 100+ inbound calls/week, 30+ tours auto-booked. • Warehouse inventory chatbot — millions of rows via RAG, 90% faster analytics for 3PL clients. • Fitness SaaS — multi-tenant React Native + Node + Stripe + AI coaching agent. • Document automation OCR — handwritten manufacturing reports → structured Excel. HOW I WORK Spec first. Loom walkthrough before I write code so we agree on scope. Production-grade output: auth, error handling, deploy pipeline, README, handover. 0–4 hour response time, typically start within 24–48 hours of contract signing. I write the code myself. If you want a 15-min demo of working systems before you commit, send a brief and I'll send a Loom of similar past work.