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Gustavo Ferreira
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Résumé

Selected work

Projects

Production systems, client work and side projects — plus an archive of earlier experiments.

Case studies

Production systems I built at Groner. The code is proprietary, so these are architecture write-ups — no source code or client data.

  • Proprietary

    GronerZap

    The WhatsApp contact center I built into the CRM to replace a third-party vendor — serverless on AWS, four WhatsApp providers, hundreds of companies.

    • Replaced a vendor that cost over R$30k a month
    • Hundreds of companies, thousands of users
    • 4 WhatsApp providers, one per number
    • First version live in 2 months
    Read case study
  • Proprietary

    Service Orders

    Field operations — inspections and installations — inside the CRM, with custom forms, configurable journeys and schedules checked against travel time. It drove dozens of plan upgrades.

    • Dozens of customers upgraded to the top plan
    • Sales and field operations in one system
    • Schedules checked against travel time and capacity
    Read case study
  • Proprietary

    Solar financing, built into the CRM

    Integrations with four banks and credit providers that run each deal’s financing — simulation, credit pre-analysis, proposal and status — from inside the CRM. Two are live, two in certification. Built solo.

    • 4 partners integrated — 2 live, 2 in certification
    • Status webhooks delivered at least once, per customer
    • Dozens of meetings with partners’ teams
    Read case study
  • Proprietary

    Gamification

    Goals, rankings and rewards for any operation in the CRM — not just what the sales rules allowed — on an engine that counts every fact once, even when it’s edited or deleted.

    • 19 metrics, from sales to closed WhatsApp chats
    • Points, cash, on-target earnings and badges
    • Every fact counted once — edits and deletes included
    Read case study

Other projects

Client work and side projects with live links.

  • Home page of the Mirene Confecções website, with a polo shirt and the headline “Uniformes de qualidade para a sua empresa!”

    Client project · Oct 2022 – Mar 2023

    Mirene Confecções

    Institutional website and an internal ERP for a professional-uniform manufacturer — finance, customers, product catalog and quotes.

    Astro Tailwind CSS Vue.js Bun Hono
    Live site (opens in a new tab)
  • Home page of GuGuitar, with a colorful painting of a guitarist and the headline “Covers e trechos de guitarra.”

    Personal project · 2022

    GuGuitar

    A media site for guitar covers and riffs, with videos, a portfolio section and user sign-in.

    Next.js React TypeScript styled-components Node.js
    Live site (opens in a new tab)

Archive

Earlier, smaller and learning projects, kept for the record.

Year Project Links
2024 Property financing simulator Java OOP coursework at PUCPR — financing simulations for houses, apartments and land, with validation and file persistence.
2023 Movie Tracker Full stack movie tracker with a Vue front end and an Express + Prisma API.
2023 SWAPI Star Wars universe explorer consuming the public SWAPI.
2022 JVM Webmarketing website Landing page for JVM Webmarketing, built while working there.
2022 Randomemes Practice project covering Next.js core concepts.
2022 Calculator Calculator built with React and Tailwind CSS.
2022 React + FastAPI Event-driven app with React, FastAPI and Redis, built following a freeCodeCamp course.
2022 Shopping cart Shopping cart with React and TypeScript, built following a Web Dev Simplified tutorial.
2022 Vue To-Do To-do list with Vue.js, Firebase and Tailwind CSS.