Build Gmail's Spam Detection Pipeline Premium
Design a spam classification system that processes 300 billion emails per day, classifies each one in under 100ms before delivery, and continuously retrains models as spammers adapt their tactics.
Build Google Docs Real-Time Collaborative Editing Premium
Design a collaborative document editor where multiple users can type simultaneously, see each other's cursors in real-time, and never lose edits even when two users modify the same paragraph at the same time.
Build Google Drive's File Sync Engine Premium
Design a file synchronization system that detects changes on any device, propagates them to all other devices within seconds, handles concurrent edits, and resolves conflicts without data loss.
Build Google Maps ETA Prediction Under Live Traffic Free
Design a route ETA system that incorporates real-time traffic signals from millions of moving devices, recalculates ETAs en route as conditions change, and serves predictions with under 200ms latency.
Build Google Photos Duplicate Detection Pipeline Premium
Design a pipeline that detects near-duplicate photos across 28 billion uploads per day using perceptual similarity rather than byte-level matching, and does so without storing a full copy of every image.
Build Google Search Autocomplete Premium
Design a typeahead suggestion engine that returns the top 10 relevant completions for any search prefix in under 50ms, personalizes results per user, and updates suggestions based on trending queries in near real-time.
Build a Social Media Hashtag Trending System by Region Premium
Design a system that indexes every post's hashtags, computes trending tags per geographic region updated every minute, and surfaces breakout trends that are gaining velocity even before reaching high absolute volume.
Build Instagram Explore Real-Time Recommendation Engine Premium
Design a content discovery system that generates a personalized Explore grid for 2 billion users, refreshes recommendations as users scroll, and surfaces trending content within minutes of it going viral.
Build Instagram Stories Expiry and Archival Pipeline Free
Design a system that automatically expires 500 million Stories after 24 hours, moves them to cold archival storage, and lets users retrieve archived Stories on demand without impacting live traffic.
Build an Inverted Index for Full-Text Search at 10B Documents Premium
Design a full-text search engine that builds and maintains an inverted index over 10 billion documents, returns results with relevance ranking in under 100ms, and updates the index in near real-time as documents are added.