System Design - databases
#01 Databases
Build a Vector Search Engine Premium
Design an approximate nearest neighbor search service that indexes 100 million high-dimensional embeddings, answers similarity queries in under 20ms, and supports live index updates without downtime.
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#02 Databases
Build a Wallet Ledger System at Scale Premium
Design a digital wallet system that records every credit and debit as an immutable ledger entry, enforces double-entry bookkeeping, and provides accurate balance reads under thousands of concurrent transactions per second.
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#03 Scalability
Build YouTube's View Count System Premium
Design a view counting system that accurately tracks billions of views per day, shows counts that update in near real-time on video pages, and resists inflation from bots and refreshes without blocking the video serve path.
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