Joao Melo
Scalable Solutions with React & Python Expertise
Ready for work
Joao is ready for their next project!
![Cover image for EN] Enterprise Medical Management Platform](https://media.contra.com/image/upload/w_1100,q_auto/vtof7izhkucbubbznhpc.avif)
EN] Enterprise Medical Management Platform | [BR] Gestão Médica de Alta Escala
[EN] Full-stack platform built for high-volume clinics. I eliminated 80% of scheduling conflicts and administrative bottlenecks using Next.js and Node.js+Prisma. Engineered a scalable PostgreSQL architecture with automated notifications, allowing the clinic to double its medical staff without increasing the administrative team.
[BR] Plataforma Full-Stack arquitetada para clínicas de alto volume. Reduzi 80% dos conflitos de agenda e eliminei gargalos administrativos utilizando Next.js e Node.js+Prisma. Arquitetura escalável no PostgreSQL com notificações automatizadas, permitindo dobrar o corpo médico sem aumentar o time de recepção.
🛠️ Skills: Next.js, Node.js, PostgreSQL, TypeScript, API Integration.
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![Cover image for [EN] High-Conversion React E-Commerce |](https://media.contra.com/image/upload/w_1100,q_auto/zlz37d4jtmrjz3bhylsl.avif)
[EN] High-Conversion React E-Commerce | [BR] E-Commerce React de Alta Conversão
📝 Description:
[EN] E-commerce architected for extreme performance and conversion. Migrating to React/TypeScript resulted in 1.2s load times (down from 5.8s), a 120% increase in online sales, and a drop in cart abandonment from 75% to 32% via optimized client-side caching and responsive UI.
[BR] E-commerce arquitetado para conversão extrema e performance. A migração para React/TypeScript resultou em carregamento em 1.2s (antes 5.8s), aumento de 120% nas vendas e redução de 75% para 32% no abandono de carrinho através de cache otimizado (React Query) e UI responsiva.
🛠️ Skills: React.js, TypeScript, Tailwind CSS, MongoDB, UI / UX.
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![Cover image for [EN] Intelligence Web Scraping Engine](https://media.contra.com/image/upload/w_1100,q_auto/gh8dueoefbv4pjsb9waq.avif)
[EN] Intelligence Web Scraping Engine | [BR] Motor de Web Scraping & Inteligência
📝 Description:
[EN] High-complexity data extraction bypassing advanced WAF protections (Cloudflare/DataDome). Engine built with Node.js and Puppeteer Stealth, featuring an IP rotation system. Extracts massive datasets and synchronizes autonomously with Google Sheets via AWS for market intelligence.
[BR] Extração de dados de alta complexidade com contorno de proteções WAF (Cloudflare/DataDome). Motor construído com Node.js + Puppeteer Stealth e sistema de rotação de rede. Realiza raspagem massiva e sincronização automatizada com Google Sheets via AWS para decisões de inteligência de mercado.
🛠️ Skills: Web Scraping, Node.js, Data Processing, JavaScript, Automation.
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![Cover image for [EN] Sheets-to-UI Sync Engine |](https://media.contra.com/image/upload/w_1100,q_auto/s9kxg3l6oxqyqxwt8ti1.avif)
[EN] Sheets-to-UI Sync Engine | [BR] Motor Dinâmico Sheets-to-UI
📝 Description:
[EN] Integration engine transforming Google Sheets into a real-time Headless CMS. I developed a dynamic React dashboard that consumes spreadsheet data via API, instantly updating catalogs and prices without manual code intervention, centralizing operations and eliminating data entry errors.
[BR] Motor de integração que transforma planilhas do Google em um Headless CMS. Desenvolvi um dashboard dinâmico em React + Node.js que reflete dados da planilha via API em tempo real. Solução ideal para atualizar catálogos e status sem intervenção de código, eliminando erros de data entry.
🛠️ Skills: React.js, Node.js, API Integration, JavaScript, Data Entry.
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![Cover image for [EN] High-End Performance Sites (SSG)](https://media.contra.com/image/upload/w_1100,q_auto/t56ml0opzsuyoe9qp75b.avif)
[EN] High-End Performance Sites (SSG) | [BR] Sites Premium de Alta Performance (SSG)
📝 Description:
[EN] High-end web development for premium brands. Engineered an SSG ecosystem with Next.js and Headless WordPress, guaranteeing a 100/100 Lighthouse score, 0.3s load times, and flawless technical SEO. Total focus on immersive design without sacrificing performance.
[BR] Desenvolvimento web high-end para marcas premium. Ecossistema SSG com Next.js e Headless WordPress, garantindo score 100/100 no Lighthouse, carregamento em 0.3s e SEO técnico impecável. Foco total na entrega de design imersivo sem qualquer perda de performance.
🛠️ Skills: Next.js, React.js, WordPress, SEO, Tailwind CSS.
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[EN] Custom AI Ecosystem (OpenAI/GPT-4) | [BR] Ecossistema de IA Customizada (OpenAI)
📝 Description:
[EN] Real-time AI tutor integrated with the OpenAI API. I developed a highly concurrent React + Node.js ecosystem with response streaming (800ms) and persistent history. The architecture successfully supports 500+ concurrent users, elevating the client's NPS from 6.2 to 8.7.
[BR] Motor de IA em tempo real integrado à API da OpenAI (GPT-4). Desenvolvi um ecossistema React + Node.js com streaming de respostas (800ms) e histórico persistente. A arquitetura suporta 500+ usuários simultâneos com respostas humanizadas, elevando o NPS do cliente para 8.7.
🛠️ Skills: Artificial Intelligence, Node.js, React.js, API Integration, TypeScript.
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![Cover image for [EN] Global AdTech Engine (L'Oréal](https://media.contra.com/image/upload/w_1100,q_auto/fhnqtd07qkqhwcwweihq.avif)
[EN] Global AdTech Engine (L'Oréal Group) | [BR] Motor AdTech Global (L'Oréal)
📝 Description:
[EN] Ultra-performance AdTech architecture built for global brands (L'Oréal, Maybelline). Engineered from scratch using pure Vanilla JavaScript (manifest-driven) and GSAP, ensuring 0.4s load times and hardware-accelerated animations. Delivered a CTR 40% above the market average across 20+ countries.
[BR] Arquitetura AdTech de ultra-performance para marcas globais (L'Oréal, Maybelline). Construída do zero com Vanilla JS puro (manifest-driven) e GSAP, garantindo carregamento em 0.4s e animações com aceleração de hardware. Entregou um CTR 40% acima da média de mercado em mais de 20 países.
🛠️ Skills: JavaScript, HTML5, CSS, Web Design, Animation/GSAP.
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Automated Price Scraper, spreadsheet & WhatsApp Notifier
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E-Commerce Application with Advanced Features
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