Full stack developer

Mobile and web apps, from database to app store.

I’m Guilherme. I design the architecture, model the database, write the Flutter app and the Laravel API, and ship it to the stores. At Inove, where I work, I build apps used by one of its clients, a Fortune Global 500 company. At my own studio, G22, I ship my own products.

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Screens from apps I shipped

people use the app I maintain at Inove
50k+
countries, from Brazil to Germany
7
products of my own live
3
years as a full stack developer
3+

G22 products

G22 is my software studio. I built every product below myself, from the database to the store.

Latr

Live

Save links, text and images from any app’s share menu and get reminded at the right moment. Works offline with no account; syncing across devices is optional.

  • Flutter
  • Laravel
  • PostgreSQL

App Store Google Play

Intentional

Live

Adds a deliberate pause before you open the apps that distract you most. The interface is Flutter; blocking runs on Apple Screen Time through three native Swift extensions.

  • Flutter
  • Swift
  • Screen Time API

App Store

Veridone

In development

Service providers prove every job: an estimate signed before work starts, before and after photos stamped with time and GPS, and a signed report the client can verify by QR code. Offline-first, with background backup.

  • Flutter
  • Laravel
  • Cloudflare R2
  • Drift

Private code

Prumo

In development

Management for family poultry farms: live temperature and humidity for every barn, a phone alert when a barn leaves its ideal range, and income and expenses tracked per barn.

  • Flutter
  • Laravel
  • PostgreSQL

Private code

Hex Deduction

Awaiting release

A deduction puzzle on hexagonal boards: 208 puzzles across 26 maps, no guessing. Hints that explain the logic, a daily challenge that is the same for everyone, and light and dark themes.

  • Flutter

Private code

Mine Variants

Awaiting release

Minesweeper where the rules change in every world: 29 worlds, each with a new rule. Pure logic, never a guess, with hints that explain the deduction, a daily challenge, and free play with your choice of rule, size and difficulty.

  • Flutter

Private code

Personal projects

Tools and experiments I make for myself.

  • Open source

    Dictum

    Voice dictation for Windows: hold a hotkey, speak, and the text appears in any app. Transcription runs locally with Whisper, so no audio leaves the machine.

    • Rust
    • Tauri
    • Whisper

  • In development

    Renvoy

    Subscription and renewal tracker that stays on your device, with totals converted by exchange rate.

    • Flutter
    • Drift

  • In development

    Lume

    Companion for reading a physical Bible that ties each commentary to its source. Offline-first.

    • Flutter

  • In development

    ClipForge

    Turns long videos into vertical clips with transcription, captions and editorial ranking, all on the local GPU.

    • Python
    • Whisper
    • NVENC

  • Fork

    Spotifast

    Fork of a Spotify client written in Rust. I adapted it to use the same native calls as the official app instead of the Web API.

    • Rust
Older projects

  • Open source

    WWatch

    App to discover movies and shows, with watchlists and where to stream them. Built on the TMDB API.

    • Flutter

Experience

  1. Jul 2023 — present

    Full stack developer, Inove Sistemas e Soluções Empresariais

    I build and maintain two mobile apps used by a Fortune Global 500 company that is one of Inove’s clients. The main one is used by more than 50,000 people in seven countries: Brazil, Argentina, Paraguay, Bolivia, Belgium, Germany and the Netherlands. Beyond the code, I decide architecture, database modeling, stack and feature planning.

  2. own studio

    Founder, G22

    My software studio. I’ve shipped Just Link, Latr and Intentional, with four more products on the way, from first sketch to the app stores.

  3. Oct 2021 — Jul 2023

    Technical support, HostGator América Latina

    Solved hosting, domain and website issues for customers, working with WHM, cPanel, CentOS and WordPress.

Fluent English (C1), intermediate Spanish (B1), and learning German, still at the very beginning.

Everyday tools

Mobile
  • Flutter
  • Dart
  • Swift
  • Drift
  • MobX
Backend and data
  • PHP
  • Laravel
  • PostgreSQL
  • Firebase
  • REST
Other
  • Rust
  • Python
  • Tailwind
  • Cloudflare R2

Let’s talk

Open to full stack developer roles and to projects through G22. Email is the fastest way to reach me.

[email protected]