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I Built an Interactive System Design Simulator — Learn by Breaking Things

The Problem Every system design resource teaches the same way: here's a concept, here's a diagram, memorize it. But in real interviews, you need to APPLY these concepts under pressure.

  • Simulator teaches system design principles by fixing issues that arise
  • Starts with single server supporting 100 users, green in color
  • Ends with 10,000,000 users experiencing cascade failure to learn circuit breakers

Your Search Query Is a Program: Composing Role-Based SQL With the Strategy Pattern

Every business application has this screen somewhere: a table of records, filter boxes above it, and a user who may only see part of the data.

  • Query starts as SELECT with WHERE clause based on user's office
  • Strategy pattern used twice: once for user visibility, another for handling request
  • Query becomes lengthy, hard-to-manage method before refactoring

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