Building an Open Source System Design Interview Coach With Interactive Simulations
summary
An open source tool called SDL models systems with a simple DSL, runs steady state simulations (not full DES), and uses discrete outcome distributions instead of continuous randoms. The demo replays a bitly shortener and an Uber architecture, generates traffic (e.g. redirect 1000s QPS vs. 10 QPS writes), measures P90 latency and utilization, toggles caches/load balancers, and simulates component kills; repo is early (v0.0.01) and is (soon) Apache‑licensed.
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chapters (11)
- 0:00System design interviews intro
- 2:06What interviews test
- 7:20URL shortener example
- 11:55Need for interactive sims
- 15:44SDL System Design Lab
- 19:50SDL demo with Uber
- 22:41SDL steady state sims
- 27:13Why SDL uses DSL
- 30:25SDL concepts and queuing
- 33:36SDL journey and future
- 38:47Q&A
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