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system-design-simulator

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Absterrg0 / sysgeeks

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Free, no-signup system design interview practice. Make design decisions, diagnose failures, and adapt to changing constraints across interactive questions and full walkthroughs: URL shortener, ride-sharing dispatch, payments, news feed, and more.

learning education distributed-systems backend scalability software-engineering interview-practice interview-questions software-architecture interview-preparation coding-interview system-design system-design-questions system-design-interview high-level-design system-design-simulator system-design-practice system-design-interview-prep system-design-mock-interview system-design-interview-practice
  • Updated Oct 14, 2026
  • TypeScript

nsachin08 / sysdesign-sim

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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.

javascript aws distributed-systems pwa simulation interactive azure capacity-planning scalability gcp cloud-computing educational no-dependencies system-design queueing-theory load-balancing-algorithm system-design-interview learning-tool software-achitecture system-design-simulator
  • Updated Sep 5, 2026
  • JavaScript

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