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Mark GusteticI build thoughtful software with AI.

This is a record of the products, systems, images, and creative experiments I have made—along with some of the thinking behind them.

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Archive / markgustetic.com

01 / Selected projects

Ideas, made real.

All projects
PX-01 / MACOS PRODUCTmacOS / SwiftUI
Pomodoro Count showing the same three tabs in its dark Synthwave theme.

Open source · v1.5

Pomodoro Count

Keep a clear record of your focus, whichever timer you use.

A macOS menu bar app that records focused sessions with one click or a keyboard shortcut. It also has a built-in timer, categories, goals, streaks, and history. Your focus data stays on your Mac.

Native macOSLocal-firstOpen source
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PX-02 / BACKUP TOOLGo / CLI + TUI
Sentra's backup wizard showing a folder picker and a preview of files in the selected directory.

Open source · Go CLI + TUI

Sentra

See what you’ve backed up and restore the files you need.

A backup tool written in Go that saves encrypted snapshots to S3 or compatible storage and avoids uploading unchanged data again. Use the terminal app to choose folders, schedule backups, browse snapshots, and restore files, or use the CLI in scripts. AI assistance is optional.

Encrypted snapshotsS3-compatibleOpen source
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02 / Different frequencies

Beyond the build.

Some things solve a problem.
Others start with “what if?”

Engineering01

Artifacts

Interfaces, systems, and applied AI.

Creative work02

Resonance

Music, images, and creative experiments.

Under the surface03

Technical

The tools and thinking behind the work.

03 / Signals from the work

Notes along the way.

All writing
01
Product Engineering7 min read

Sentra: Backups I Can Inspect and Restore

I built Sentra to make backups easier to check: see what was saved, understand what runs next, and restore the files you need.

02
Product Engineering6 min read

Pomodoro Count: Keeping Track of Focus

I like using a physical timer. I built Pomodoro Count to keep a record of those sessions without adding another window to my day.

03
Go Agent Systems15 min read

Building Agents in Go: Contracts, Tools, and Concurrency

Go is a good fit when an agent needs to run as a dependable service: tools with clear contracts, timeouts, approval checks, and state that survives a restart.

Etched blue glass architecture above dark water, with an ember-orange stream weaving through its reflections.
Always a work in progress.

04 / The person behind it

Curiosity is
the constant.

I’m Mark, a programmer who likes making things. Software is a big part of that. So are images, music, and experiments that don’t fit neatly into a category.

AI has become part of how I explore and build. This site is where I keep the things that come out of it.

More about me