Software Engineer · Rio de Janeiro, Brazil
João Vitral.
I build websites, apps and systems — from the pages where Brazil meets Fiat, Jeep and RAM cars to the software the São Paulo state government relies on every day.
How I can help
What I build.
From the store that needs to sell more to the system that can't go down — including the model that learns from your data.
Websites and stores that sell
Fast pages that look great on mobile and are designed to turn visitors into customers — not just to look pretty on the owner's desktop.
I built the launch pages for Fiat, Jeep and RAM — fixed dates, nationwide audience — plus e-commerce sites with online payments.
Next.js · React · TypeScript · Stripe
Custom apps and systems
For when the spreadsheet can't keep up: a system that organizes your process the way it actually works.
I created DeuQuantas from scratch — app, site and server — and built the patient app for Hospital Sírio-Libanês.
Node.js · React Native · APIs · PostgreSQL
Large systems that can't fail
Software that serves thousands of people and has to stay up every day — secure, and with no surprises.
Today I build the systems used by the São Paulo state government, at Unisys, with mainframe integration.
C# · ASP.NET · SQL Server · Docker
Applied artificial intelligence
Using the data you already have to predict, classify and automate decisions — without turning it into a magic-trick promise.
I train neural networks to forecast financial asset prices and classify medical exams, as part of my Computer Engineering degree at UERJ.
Python · Neural networks · LSTM
Process automation and integration
The repetitive work that eats up a person every week — copying data from one system into another, rebuilding the same report, telling whoever needs to know — starts happening on its own.
I run my own automations on a VPS: this site's blog triggers the draft of the LinkedIn post, and the workflow is open in the repository. At work, I integrate a government system with a mainframe.
n8n · MCP · Docker · APIs
Process
What working with me looks like.
From first contact to launch — you know what happens at every step, and what it costs, before you decide.
You tell me the problem
A simple conversation — no jargon, no commitment. It can be “my site doesn't show up on Google” or “my operation no longer fits in a spreadsheet”.
I map the path
You get a written proposal with scope, deadline and price locked in. No surprise fees, no endless “it depends”.
I build while you follow along
First the wireframes and screen designs, then working partial deliveries — instead of me disappearing for months and coming back with something you didn't ask for.
Live, and measured
I ship it, set up the measurements — visits, leads, sales — and stay close to evolve whatever the numbers show.
Not sure your case “needs a programmer”? Tell me the problem — translating it is my job.
Start the conversationSelected work
Featured projects.
DeuQuantas — The right bill, no fights
An app that ends the argument over splitting the bill at the bar. Everyone pays for what they had, the owner photographs the menu to update prices, and a ready-made report arrives at the end of the week.
My product: from idea to live SaaS, end to end
Viert Atelier — Premium occasion wear
The website of an occasion-wear atelier: collection photos fill the whole screen, load fast on mobile, and take the customer straight into the WhatsApp conversation — which is where the dress is actually sold.
The brand's official digital showcase, converting via WhatsApp
Faro Beach Club — Events in Leblon
The website of one of Rio's most sought-after event venues. Visitors see the seaside space, find the section for their type of event, and request a quote without hunting for it — the button follows the entire page.
The venue's official event lead-capture channel
CBL — Legal Consulting
The website of a legal consulting firm: sober, direct and easy to find on Google — because people looking for a lawyer need to trust before they even call.
The firm's official digital presence