[SYSTEM DESIGN] Instagram

Full Instagram architecture: post upload, feed generation (fan-out on write), social graph, engagement. Covers pre-signed URLs, cache-aside, CQRS, event-driven patterns.

Premium unlocks the full interview-prep walkthrough

Where the architecture fails first and how to defend the design.
Concrete capacity math, data sizes, throughput, and scaling thresholds.
ADR-style trade-offs you can turn into a structured interview answer.
Runnable scenarios for happy path, failures, retries, and recovery.

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