System Design Interview
Layered moderation for a large community, inspired by Discord and Reddit: known-bad content matched by hash, a fast classifier that decides most posts in milliseconds, an LLM that reviews the uncertain ones against the written rules, and human moderators for the hardest cases and appeals. A teaching design.
Build this system yourself on the canvas below. Add components, connect them, and run traffic simulations to see where your design holds up and where it breaks.
You're in the middle of an interview session. Leaving now will end your current attempt.
Explore concept overviews, real-system examples, key tradeoffs, and interview talking points for each roadmap section.
You've conquered this phase. These are the skills you now own:
