Tax Calculation Engine Low-Level Design Tax calculation sits at the intersection of accuracy and auditability: a one-cent rounding error multiplied […]
Image Moderation Pipeline Low-Level Design User-generated image content requires automated screening at scale. A purely manual review operation collapses under
Knowledge Base System Low-Level Design A knowledge base must do three things well: let authors maintain accurate articles without losing
Bulk Data Import System Low-Level Design Bulk import is one of those features that looks straightforward until a user uploads
Audit Log Export System Low-Level Design Compliance teams and security analysts regularly need bulk exports of audit log data for
Device Management System Low-Level Design A device management system answers three security questions: what devices have accessed an account, how
Push Notification System Low-Level Design A push notification system must reliably deliver time-sensitive messages to millions of devices across Android
Data Retention Policy System Low-Level Design Every production database accumulates data that must eventually be purged, archived, or anonymized —
Two-Factor Authentication Backup Codes: Low-Level Design When a user loses access to their TOTP authenticator app, backup codes are the
