Work you keep, not exercises you throw away.

A step sequencer in the browser, built for polyrhythm. Real audio scheduling, patterns you can share, and timing that holds.

Audio timing that does not drift. Most browser sequencers do, and a reviewer who knows will notice.

An interactive atlas of a history that is usually told without numbers, drawn from scratch and readable without a mouse or a screen.

Hand-built visualization with no charting library, and it works for somebody who cannot see it.

A webhook relay: take an event once, verify it, and deliver it reliably to everybody who asked for it.

Retries, backoff and a dead letter queue. This is infrastructure, and it reads as infrastructure.

A public, documented, rate-limited read API over a real dataset, built to the standard you complained about not getting.

The API you wished existed when you were consuming them. Documented well enough that somebody else uses it.

A shared listening room. Everybody hears the same thing at the same moment, votes on what is next, and sees who else is there.

Real-time, multi-user, and synchronized. Everybody's screen agreeing is genuinely hard and obvious when it works.

A data collection tool for places without reliable signal. It works offline completely, then reconciles when it can.

Works with no signal, then reconciles. Offline-first is the hardest thing on this page and the most respected.

Reimplement a tool you use every day, properly. The requirements are already written, so the only question is your engineering.

A tool people already know, rebuilt to a standard they can judge instantly. There is nowhere to hide.

Get a real change merged into a project you did not write, working to somebody else's standards and review.

Merged code in somebody else's repository. Working inside constraints you did not set is a signal nothing else on this page gives.