Your data, your device
Everything you have done, and what it moved.
Which skills are proven and which are below par, how each interview round has scored sitting by sitting, and the dated record the whole page is worked out from. Every number here is arithmetic you can recount — there is no streak, no percentile and no readiness score, because a figure nobody can stand behind is worse than no figure.
All of it is worked out in this browser from your own results, and none of it leaves the device unless you ask. That has one cost — clearing your browsing data clears it too — so backup, calendar and sync are further down the page.
What we can and cannot see
We have no account for you, so there is nothing to look up. If you turn on sync, your progress is encrypted in this browser before it is sent and stored as a blob filed under an anonymous id. The key is derived from a recovery code that is generated here and never transmitted, so the server holds ciphertext it cannot read and an id it cannot trace back to you or to your subscription.
Two things are never recorded in the first place: your licence key and any job description you paste. They stay out of the log, which means they cannot end up in a backup file or in a synced copy.
More detail is on the privacy page.