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abrahao-dev/README.md

Matheus Abrahão

Full Stack Developer | GenAI & LLM Specialist | Next.js | React | Node.js | Cloud

Portfolio Instagram LinkedIn Email

🚀 Tech Stack

LLMs & GenAI

LangChain OpenAI FAISS ChromaDB PostHog

Frontend

React Next.js TypeScript Tailwind CSS Vite Storybook

Backend

Node.js Python Java GraphQL REST APIs

Cloud & Infrastructure

AWS Vercel Docker GitHub Actions Postman

Databases

Supabase MySQL Firebase

🏆 Professional Summary

As a Full Stack Developer, I specialize in building modern, scalable applications with expertise in GenAI and LLMs. I have extensive experience implementing AI-powered solutions using LangChain, OpenAI, RAG (Retrieval-Augmented Generation), and vector databases like FAISS and ChromaDB.

Since 2021, I've led the entire technical operation of Martin4Shop, a profitable men's fashion e-commerce business I built from scratch, where I applied AI to automate customer support and sales workflows by connecting LLMs to proprietary business data.

In 2025, as an AI Engineer at Cleatus AI, I developed an internal chatbot powered by LLMs with RAG, integrated with PostHog Analytics and business APIs, implementing prompt engineering with fallback logic and vector search using embeddings.

🎯 Focus Areas:

  • GenAI & LLMs: LangChain, OpenAI, RAG, vectorization, FAISS/ChromaDB, prompt engineering
  • Full Stack Development: React, Next.js, TypeScript, Tailwind, Node.js
  • API Development: REST/GraphQL, authentication, performance optimization, versioning
  • Infrastructure: AWS (EC2, S3, Lambda), Vercel, GitHub Actions, Supabase
  • Software Craftsmanship: SOLID principles, Clean Code, modular architecture, testing

🎓 Education

  • Computer Engineering - Universidade São Francisco
  • Swift Live - iOS Labs Development Course (Swift & SwiftUI)

📩 Contact & Portfolio

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  1. abrahao-labs-chatbot abrahao-labs-chatbot Public

    AI-powered chatbot for digital marketing, using LangChain, Hugging Face fine-tuning (DistilGPT2), and RAG techniques with PDF, CSV, and TXT file support.

    Python

  2. nft-marketplace nft-marketplace Public

    🎨 Complete NFT Marketplace - Full Stack Web3 dApp A decentralized NFT marketplace built with modern architecture, featuring React frontend, Go backend, and Solidity smart contracts. Includes wallet…

    TypeScript

  3. BitcoinMarketTrends BitcoinMarketTrends Public

    Analyze historical Bitcoin data using clustering and pattern recognition to uncover market trends and potential price movements.

    Jupyter Notebook

  4. messaging-app messaging-app Public

    A scalable, real-time messaging platform built with Java (Spring Boot), RabbitMQ, React, and Redux. Easily exchange messages through a modern UI with robust backend services. Featuring real-time up…

    JavaScript

  5. my-portfolio my-portfolio Public

    This is my personal portfolio website, showcasing my skills, projects, and experience as a Software Engineer specializing in backend and mobile development. The site is built with modern web techno…

    TypeScript

  6. space-invaders-ios-game space-invaders-ios-game Public

    A modern iOS remake of the classic Space Invaders game, built with Swift and SpriteKit. Smooth controls, wave progression, power-ups, and explosive effects.

    Swift