Volodymyr B.

If your AI feature works in the demo but breaks on real users, real documents or real costs, I fix that part. ✔ 89 projects, $300K+ earned, 100% Job Success ✔ An AI chatbot I built answers 300+ customer chats a day for a UK energy company ✔ Zappr AI, our own B2B SaaS, grew from 10 to 10,000+ users ✔ I usually reply within an hour, message me or book a call from this profile I am the full stack developer AI teams hire when one person has to own the whole product: the React front end, the Python backend, the LLM layer and the deploy. I also work as an agentic AI developer on RAG systems and AI agents for B2B SaaS companies. 🚀 FULL STACK DEVELOPER AI I spent 8 years as a web and software developer before AI. Today every product I ship as a full stack developer has an AI part, and 20+ products got an LLM feature without breaking what already worked. As a Python full stack developer I build the backend on FastAPI and the front end on React and Next.js from your UI UX designs, then ship in Docker on AWS. A full stack developer AI founders can call directly saves them a second hire and a week of handover. When the job is a full stack developer AI product with real users, I own it from the database to the button. 🧠 AGENTIC AI DEVELOPER As an agentic AI developer I have shipped 25+ AI agents on LangChain and LangGraph, the largest handling 300+ conversations a day. An agentic AI developer is judged by what the agent does on bad inputs, so every agent ships with 30 to 50 test scenarios, a token budget and logged tool calls. I have also built 15+ MCP servers so AI agents use your APIs with clear permissions. Clients bring in an agentic AI developer for support, research and document agents, and for lead qualification before a closer gets on the call. Some clients look for an AI agent builder or a full stack AI SaaS developer, and the work is the same. 🏢 B2B SAAS As a SaaS developer I take a B2B SaaS from a written spec to paying users in 6 to 12 weeks, with 15+ AI SaaS products shipped. Auth, Stripe billing, multi tenancy, the admin panel and the LLM layer live in 1 codebase you own. Zappr AI is our own B2B SaaS, and as its full stack AI SaaS developer I know what a B2B SaaS needs after launch, not only before it. Every MVP gets a handover document, so the next full stack developer on your team can take over. 📄 RAG AND LLM 100,000+ documents processed across 15+ RAG pipelines on the LLM of your choice. One RAG system cut document processing at an Italian port from 2 days to 3 minutes, and cost per document from 100 euro to 1 cent. In a RAG build retrieval matters more than the LLM, so I tune it on the questions the system got wrong. Machine Learning is rarely needed here: a little Data Analysis on your own chats shows what to fix first. 💬 AI CHATBOT 20+ AI chatbot projects for web, WhatsApp and Telegram. The busiest answers 300+ support chats a day at 60% ticket deflection, with a RAG knowledge base your team edits and a handoff to a person. Our latest B2B SaaS build was an AI chatbot app on the MERN stack, $14,000, rated 5.0. 📂 SELECTED WORK ✔ Italian port: agentic RAG for ship documents, 2 days to 3 minutes ✔ Energy company: RAG support chatbot on LangChain and pgvector, 300+ chats a day ✔ Dealership network: a scraping agent reads 100,000+ pages a day so the LLM sales chatbot quotes real inventory ✔ KYC compliance B2B SaaS: an AI agent with every tool call logged, rated 5.0 ✔ Zappr AI: our own AI agent builder on LangGraph and FastAPI 🛠 HOW I WORK ✔ Software Consultation first, then a written plan ✔ A demo every week and commits in your Git repository from day 1 ✔ Software Testing before every release, with LLM evals for every AI feature ✔ Software Architecture & Design written down, so your team can change a prompt without me You get one accountable full stack developer AI clients talk to from spec to release, plus 1 or 2 engineers from my Rellian AI team when needed, under one Upwork contract. 🤝 WHO HIRES ME ✔ Founders who need a full stack developer AI product built from zero ✔ B2B SaaS teams who need an agentic AI developer for one hard LLM feature ✔ Product teams who need an agentic AI developer to add RAG search to a live app ✔ Agencies that need a full stack developer AI clients can talk to directly ✔ Companies whose AI agent demo broke on real users ✔ Support teams who need an AI chatbot for the 20 questions they answer all day 📩 Message me or book a consultation here. Tell me the problem in 2 or 3 sentences and within an hour you get the first step, a timeline and a price range.