15 exhaustive articles covering how real systems are built at scale. Not a buzzword tour, a deep understanding through interactive diagrams, simulators, and worked trade-offs.
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What really happens when you type a URL.
Vertical vs horizontal. When systems buckle and how to fix them.
Routing traffic intelligently across servers.
The fastest request is one you never make.
Not just syntax, a fundamental design choice.
O(n) full scans vs O(log n) index lookups.
Consistency, Availability, Partition Tolerance: pick two.
Three paradigms, three different trade-offs.
Decouple producers and consumers. Handle backpressure.
The honest trade-off guide.
Token bucket, leaky bucket, and sliding windows.
Who are you? What are you allowed to do?
Serve content from 50ms away instead of 200ms.
Design for failure. Build systems that bend, not break.
Put it all together: design a URL shortener end-to-end.