Software

Software built and published by General System Dynamics LLC — focused, privacy-respecting apps for Apple platforms, and open-source tools for AI-assisted engineering.

Apps

Rossino 🍅

Rossino is a Pomodoro timer for people who live in the Apple ecosystem. Built natively for the Mac, with iPhone, iPad, and Apple Watch on the way, Rossino keeps focus sessions simple: start a timer, do the work, take the break. Your timers and history stay on your devices, synced privately through your own iCloud — Rossino has no accounts, no ads, and no tracking.

Coming to the App Store.

More about Rossino — features and an illustrated guide →

Rossino support

Questions, bug reports, and feature requests: use the contact form. We aim to respond within two business days.

Rossino privacy policy

Rossino stores your data on your device and, if you enable sync, in your private iCloud (CloudKit) storage that only you can access. Rossino has no accounts, no analytics, no advertising, and no tracking. We never see, collect, or sell your data.

Read the full Rossino privacy policy →

Open source

Senior Engineering Partner

An open-source engineering-discipline skill for AI coding agents (Claude Code and compatible tools): a strict code reviewer, pair programmer, debugger, and mentor that enforces a security floor, test-driven workflow, and phase-aware rigor from prototype to production. Apache-2.0, OpenSSF Best Practices certified.

github.com/bjgreenberg/senior-engineering-partner