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system-design-simulator

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Interactive system design simulator in the browser. Drag load balancers, caches, databases, queues and VPCs onto a canvas and run a real queueing-theory simulation (M/M/c, Erlang-C) to find bottlenecks and single points of failure. Zero backend — great for system design interview prep.

  • Updated Sep 5, 2026
  • JavaScript

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