Systems built at Rumo Soluções have no public code, so I explain the problem and the decisions instead. Most independent projects link to their code.
Manages the maintenance of industrial equipment, from arrival at the workshop to the report delivered to the customer.
Brings together in one system what used to live in paper, Trello and spreadsheets, with a full history and an automatic PDF report.
.NET 10 · React 19 · TypeScript · PostgreSQL · Docker · Azure DevOps · Spec Kit · Claude Code
Finds the FIPE code (Brazil’s vehicle price table) for each car subscription offer, even when the description is incomplete or worded differently.
New algorithm in production since October 2026, guided by one simple rule: a wrong price is worse than a missing price.
.NET · C# · MongoDB · OpenAI · Docker · Azure DevOps · Spec Kit · Claude Code
Website and admin panel for Primeira Igreja Batista em Lagoa Santa, which replaced the WordPress site without raising hosting costs.
More than 1,600 automated tests in a system planned to last over 5 years with a single person running it.
Laravel 13 · PHP 8.4 · React 19 · TypeScript · MySQL · Playwright · Spec Kit · Claude Code
Workout app with an AI personal trainer that talks to the user, builds the week’s plan and tracks progress.
Google login, real-time AI chat and consistency stats, all open source.
Next.js 16 · React 19 · Fastify · Prisma · PostgreSQL · Gemini
This website: portfolio, blog and content panel, built as a real software product.
Open documentation, automated tests and 10 CI checks on every change.
Next.js 15 · Fastify · PostgreSQL · Drizzle · Spec Kit · Hexagonal architecture
Inventory control for the church storeroom, with minimum stock alerts and reports.
Stock in and out, a dashboard with charts, and PDF and CSV reports highlighting critical items.
React · Node.js · Express · PostgreSQL · Supabase
Website for the youth group of Primeira Igreja Batista em Lagoa Santa, with events, devotionals and a podcast.
Rewritten from scratch in Next.js from an old HTML, CSS and JavaScript site.
Next.js · React · TypeScript · Tailwind CSS · Vercel
Website for Lar de Idosos Recanto Vida, a care home in Confins, Brazil, presenting its work and inviting the community to contribute and volunteer.
I built the site, contracted the hosting, and remain responsible for the institution’s hosting, domains and email.
WordPress · Elementor · HostGator