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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 · v1.1

Pomodoro Count

A native macOS menu bar app for recording focused sessions, whether they happen with a physical timer, a keyboard shortcut, or its built-in timer. It keeps categories, goals, streaks, and history private and out of the way.

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

A Go backup tool that saves local folders to S3 or S3-compatible storage as encrypted, deduplicated snapshots. A synthwave terminal interface brings folder selection, schedules, snapshot browsing, and restore into one place, with a scriptable CLI and optional AI assistance alongside it.

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

Building a Go backup tool around encrypted snapshots, a synthwave terminal, and the practical work of knowing what is backed up and how to get it back.

02
Product Engineering8 min read

Pomodoro Count: A Tally for Focus That Happens Somewhere Else

Pomodoro Count is a native macOS menu bar app built around a small premise: the best focus timer may be physical, but the record of your work should still be useful.

03
Go Agent Systems15 min read

Building Agents in Go: Contracts, Tools, and Concurrency

Go becomes useful for agent systems when the hard part is operating a bounded runtime with contracts, cancellation, policy, and durable state.

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