Harris T.

Most AI freelancers hand you a script you cannot ship. Most web developers cannot build the agent in the first place. The gap between those two is where your budget disappears. I build AI agents and the web and mobile apps they live inside - one accountable partner for the model, the API, the interface and the hosting. Production AI delivered for Microsoft. Top Rated on Upwork with 100% Job Success and 5.0 stars on every contract closed. I lead a 25-engineer team, so every build ships with architecture review, QA and DevOps behind it. 1. AI AGENTS AND AUTONOMOUS WORKFLOWS - Multi-agent systems on LangGraph, LangChain and CrewAI: state machines, tool calling, retries and human-in-the-loop approval gates - Per-run token and cost caps, so your LLM bill never surprises you - Agents wired into the tools you already run: HubSpot, Salesforce, Slack, Notion, Gmail, Stripe and internal APIs - Every agent decision logged and traceable from day one 2. VOICE AI AGENTS - Real-time inbound and outbound voice on Twilio, LiveKit and the OpenAI Realtime API - Sub-second response latency with barge-in handling, so the agent never talks over your customer - Deepgram and Whisper transcription, ElevenLabs voice synthesis - Warm transfer to a human, automatic call disposition and full transcripts pushed to your CRM 3. RAG AND LLM SYSTEMS THAT DO NOT HALLUCINATE - Retrieval augmented generation on Pinecone, Weaviate, Qdrant and pgvector with hybrid search and reranking - Chunking and metadata strategy built around your actual document structure - An evaluation harness so you can measure answer accuracy instead of hoping for it - Citations on every answer so your team can verify the source - OpenAI, Anthropic Claude, Gemini and open-weight LLaMA models, fine-tuned only where it earns its cost 4. WEB APP DEVELOPMENT - Next.js, React, TypeScript and TailwindCSS front ends - FastAPI, Node.js and Django back ends on PostgreSQL, Supabase or MongoDB - Multi-tenant SaaS with role-based access, Stripe billing and usage metering - Admin dashboards where you can see, audit and override everything the agent did - Streaming AI responses instead of a loading spinner 5. MOBILE APP DEVELOPMENT - React Native and Flutter for iOS and Android from a single codebase - Offline-first sync, push notifications, in-app purchases and biometric auth - AI features that stay fast on real mobile networks - App Store and Google Play submission handled end to end, review pushback included SHIPPED, NOT PROTOTYPED Docker, CI/CD, AWS, GCP and Vercel. Monitoring, alerting and cost dashboards configured before launch. Clean, tested, documented code your next developer can actually read. SELECTED WORK - ELEVA - AI-native email assistant SaaS built on React, FastAPI and OpenAI - AI voice-call campaign engine with automatic disposition analysis and CRM logging - Document intelligence agent that reads contracts, extracts key terms and flags risks and deadlines - AI sales assistant that listens to live calls, suggests responses and drafts follow-ups in real time - Workflow orchestrator connecting CRM, Slack, Notion and email into one automated pipeline HOW WE WORK Week 0 - Free 30-minute scoping call. You leave with an architecture sketch and a fixed price, whether you hire me or not. Week 1 - A working prototype on your real data or your real call flow. You see it run before committing further. Weeks 2 to 4 - Build, test, iterate. Friday demos and direct Slack access to me. Launch - Deployed, documented and handed over, with 30 days of post-launch support included. WHO I WORK BEST WITH - Funded startups and enterprise teams with builds of 5,000 USD and up - Companies replacing real manual work: call centres, document review, support queues, internal ops - Founders who want one partner owning the agent, the app, the API and the hosting Not a fit: one-off prompt tweaks, unpaid proofs of concept or hourly script patching. Tell me your problem in two sentences. You will get an approach, a timeline and a number back within 4 hours.