Principal Data Engineer
Covert Messenger: Concealed Private Messaging Platform
A private two-person chat behind a working Formula 1 dashboard, with an ordered event feed, idempotent sends and no chat data left in the browser.
Covert Messenger: Concealed Private Messaging Platform
Systems Architecture & Security
JavaScript • PHP 8 • MySQL 8 • HMAC-SHA256
Mar 2026 – Present
A private two-person chat concealed behind a complete Formula 1 dashboard and reached only through an entry nothing on the page shows. I engineered an ordered change feed in which every send, edit, deletion and reaction commits under one database lock and writes an event per changed message, so both clients converge by cursor without missing or reordering a change, verified under 40 concurrent sends against real MySQL. Retried sends return the stored message instead of a duplicate, 1 MiB chunked uploads are checked against a server-side manifest, and pending files stay visible only to their uploader. A stateless HMAC-SHA256 token bound to the device, a PBKDF2-hashed entry lockout and a session that leaves no chat data in the browser once the tab closes complete the design, verified by 104 PHP and 89 Chromium gate checks.