Your name, email address and profile picture, as Google provides them when you sign in. The applications you log — company, role, status, dates, location, link, source — along with the notes you write and the record of every status change. Any file you upload, and which application it was sent with.
Every record is filed under your account, and the database rules reject any read or write from a different account. Nothing you log is visible to another user of Jobs. Being straight about the limit of that: the database is hosted, so whoever operates this app can reach the underlying data through the hosting provider's console, as is true of any hosted service.
There is no analytics, no tracking and no advertising. Nothing is sold, shared or used to train anything. No third-party script runs on any page.
A sign-in token, so you are not asked to sign in on every visit. Nothing else is kept, and there are no advertising or analytics cookies.
Delete account, in the menu under your photo, removes every application, note, status change and uploaded file, and then the account itself. It runs immediately and cannot be undone.