90x · how it fits together

90x Architecture

How 90x, an interview-prep app, works under the hood: the system, how content is made, a learner's day, one tap end to end, and what keeps it safe. Every diagram is traced from the open-source code.

Start hereArchitecture Atlas

Ten clean, tap-to-explore diagrams on one page, with what each box does and where it lives in the code.

Open the atlas → First draftArchify diagrams

The original ten diagrams made with Archify: denser, with pan, zoom and export.

Open the diagrams →