I’m a full stack developer specialized in building modern, scalable applications with strong software engineering principles. My main focus is on Generative AI (GenAI), LLMs, and enterprise-grade RAG (Retrieval-Augmented Generation) solutions, using technologies like LangChain, OpenAI, FAISS, ChromaDB, and context-aware prompt engineering.Since 2021, I’ve independently led the technical operations of Martin4Shop — a profitable menswear e-commerce business I built from scratch. Beyond full stack development, I implemented AI-driven automations for customer service and sales, and connected LLMs to proprietary data through internal pipelines, significantly boosting operational efficiency and conversion.In January 2025, I worked as an AI Engineer for Cleatus AI (USA), where I developed an internal chatbot powered by LLMs + RAG architecture. The solution integrated with PostHog Analytics and enterprise APIs, and included prompt engineering with fallback logic, optimized vector search using embeddings, SQL query parsing, and metrics evaluation such as latency and response relevance.I have full ownership of the development lifecycle — from front-end (React, Next.js, Tailwind) to back-end (Node.js, REST/GraphQL), relational and NoSQL databases (Supabase, Firebase), document vectorization, deployment pipelines (GitHub Actions), automated testing, and modular architecture following Clean Code and SOLID principles. I’ve also studied and applied classic supervised ML models (SVM, Naive Bayes, KNN, K-Means) as well as lightweight fine-tuning and optimized embeddings for classification and context retrieval tasks.Core Technical Skills:• LLMs & GenAI: OpenAI, LangChain, Prompt Engineering, RAG, FAISS, ChromaDB, Embeddings, Fallback strategies• Development: React, Next.js, TypeScript, Tailwind, Node.js, Python, Java• APIs: REST/GraphQL, authentication, performance, versioning• Infrastructure: AWS (EC2, S3, Lambda), Vercel, GitHub Actions (CI/CD), Supabase• Best Practices: SOLID, Clean Code, unit and integration testing• Databases: MySQL, Supabase, Firebase (NoSQL), embedding stores• Tools: Figma, Storybook, Postman, Docker, PostHog, VitePortfolio:🔗 Personal Website: www.matheusabrahao.com.br📁 GitHub: github.com/abrahao-dev🏢 Software House: www.abrahaolabs.com.br📧 Contact: contato.matheusabrahao@gmail.com
