Helping build the next generation of social platforms!
Core backend/devops contributor for QuoteVote:
A modern, open-source, text-only platform fostering real-time, deliberative chatrooms.

• Full-stack refactor with Node.js 20+, Express 5, GraphQL (Apollo), MongoDB.
• Led Dockerization and CI/CD modernization for the monorepo.
• Migrating legacy logic to a robust, type-safe architecture with strict TypeScript and Next.js 16.
• Collaborating on distributed systems principles, real-time communication and performance optimizations.

Hi, I’m Otavio, a passionate Brazilian backend developer focused on building robust, scalable, and user-centered software.

• 🏆 Backend Specialist: Java, Spring Boot, REST APIs, Security
• 🧩 Full-Stack Explorer: TypeScript, Next.js, Node.js, NestJS
• 💡 DevOps & Cloud: Docker, Linux, AWS, CI/CD, Nginx
• 🤝 Open-source first — ask me about how to collaborate!
• 📚 Always Learning: Distributed Systems, GraphQL, System Architecture

Languages & Backend:
Java · Spring Boot · Spring Security · Spring Data JPA · TypeScript · Node.js (Express/NestJS)
Frontend/Fullstack:
Next.js · React · TailwindCSS
Databases:
PostgreSQL · MongoDB · MySQL · Redis · Flyway
DevOps/Cloud:
Docker · Docker Compose · AWS (EC2) · Nginx · CI/CD · Linux
Other:
GraphQL · REST · PWA · Firebase

A Catholic spiritual platform to deepen and organize your prayer life—track your daily Rosary, meditate on Mysteries, access a curated spiritual library, and celebrate your faith with gamified streaks.

• Full installable PWA, responsive and optimized for mobile and desktop.
• Daily check-ins with selection of Mysteries, intentions, reflections and feedback.
• Automatic streak tracker and achievement system for continuous motivation.
• Dynamic content library with teachings, traditional prayers and resources.
• Built as a full-stack monorepo: Next.js 16 (App Router) frontend, NestJS 10 API, MongoDB 7.
• Fully containerized for deployment with Docker Compose and Coolify.
• Domain: HaveYouPrayedTheRosaryToday

Personal portfolio and technical blog:
Showcasing who I am and what I do, built to be fast and accessible.

• Clean, modern design with responsive layouts and dark/light themes.
• Projects gallery with detailed writeups and live links.
• Dev blog with posts on backend, infrastructure, and productivity.
• Powered by Next.js 14, TypeScript, TailwindCSS, and deployed to Vercel.
• Dockerized for professional development workflow and easy portability.
• 🌐 ximarelli.dev

CAF Torneio is a full-stack, modular platform for managing and tracking amateur football tournaments.

• Live Experience: Real-time match timer, event tracking (goals, cards), and dynamic scoreboards.
• Competition Engine: Automated fixture generation (Round-Robin) and dynamic standings calculations (wins, draws, goal differences).
• Administrative Control: Admin dashboard for team management, logo uploads, and an intelligent penalty/suspension system.
• Premium Tech Stack: Monorepo architecture (Nx) powered by NestJS (REST API), PostgreSQL (Prisma), and React + Vite on the frontend.
• Quality & Design: Highly responsive interface built with Material UI (MUI), Framer Motion, and TailwindCSS, fully integrated with Google Analytics 4.

Full-stack nutrition and food management tool powered by AI.

• Google OAuth2 authentication, session persistence with Spring Session JDBC.
• Complete CRUD for foods with nutritional data and user-specific preferences.
• AI-powered recipe generation using Spring AI and the Maritaca API—get meal suggestions based on your pantry and dietary goals!
• Clean, dashboard-style UI.
• Technologies: Spring Boot, PostgreSQL, Redis, Flyway, Docker Compose, Nginx.
• Built for easy public cloud deployment, runs on AWS EC2.
• 🌍 Demo (currently offline): aifoodapp.site