Option Tab
Go / Wails / ReactSwitch between individual windows with live previews, fuzzy search, and custom keyboard shortcuts. A macOS utility for moving through a busy desktop without losing track of your work.
The portfolio of Guilherme Vozniak
Built out
of curiosity.
I’m a software engineer. As a kid, I thought I could run Windows by putting it inside an HTML tag. This is that idea, revisited: explore my desk, open the computer, and discover the things I build.
View projects Welcome to my cornerDrag to look around
Setting up the studio…Real desk. Endless possibilities.
Make yourself at homeEverything starts with “what if?”
A few things I’ve put into the worldDifferent ideas.
Different ideas.
Same curiosity.
Desktop apps, an old Nokia with a new purpose,
and the software behind my hardware.
A closer look at what I’ve been building.
Burner Wallet
Java ME / Rust / TypeScriptTurning an old Nokia phone into an offline Bitcoin wallet. The phone signs transactions; a companion app handles the network. A pre-alpha experiment, tested in emulators only.
Blue Macaw
Rust / Tauri / ReactA desktop dictation app for macOS and Windows, built with a friend. Use a global shortcut to turn speech into text in the focused app with your own provider key.
Tiles Spliter
Go / Wails / TypeScriptSnap and arrange macOS windows by dragging, using a keyboard shortcut, or choosing a layout from the menu bar. Keep the apps you need visible side by side.
App Cleaner
Go / Wails / ReactFind caches, duplicate files, and leftover app data on your Mac. A desktop app and terminal interface share one cleaning engine, with backups that let you undo supported cleans.
Calendium
Go / React / React NativeAn email and calendar workspace designed for keyboard-first workflows across web, desktop, and mobile. Still in development, with open-source clients and a backend designed to run on your own server.
9Router
Go / Wails / ReactConnect coding tools to multiple AI providers through one local endpoint. This Go and Wails port of 9Router pairs a routing core with a desktop dashboard for managing connections.
DragZone
Go / Wails / ReactA macOS menu-bar utility for moving, copying, archiving, and sending files. Drop them onto an action or keep them on a temporary shelf, ready to drag into another app.
RockPi Penta
Go / Linux / GPIOA Go controller for Penta SATA hardware that monitors temperatures, adjusts fan speed, and displays system information on an OLED screen. Configurable button actions bring everyday controls to the board.
</> Some ideas never leave.
I wanted to put
a whole computer
inside an HTML tag.
HTML and CSS were my first tools. I thought a Windows executable in a source attribute might do the trick. Years later, this is my slightly more informed second attempt.