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A full mock interview for TinyLink: clarify, estimate 120,000 redirects a second and 300 TB, sketch the architecture, then deep-dive into short code generation, viral URLs, sharding, rate limits and replication, and finish with edge cases, failures and monitoring. Every Week 1 idea in one answer.
Previously, on Day 5, you designed a session store for 10 million users, and saw the whole week inside one system: partitioning, replication, rate limiting and hot keys.