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System Design: Feed System (Twitter/Instagram)
Published: at 11:15 AM(9 min read)Designing a social media feed system — fan-out on write vs read, the celebrity problem, hybrid model, ranking, and stories. The most complex system design so far.
System Design: Notification System
Published: at 11:00 AM(9 min read)Designing a notification system end-to-end — fan-out, channel routing, idempotency, DND, real-time counters, and the right level of complexity for each feature.
System Design: URL Shortener
Published: at 10:45 AM(8 min read)Designing a URL shortener end-to-end — scale estimation, slug generation, caching, database choices, and failure handling. First complete system design.