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13+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes url shortener, rate limiter, chat system, notification service, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
System design cases are the concrete interview problems that apply the system-design primitives. This module is an elevation arc: it opens with URL shortener (the classic warm-up), then rate limiter, then the communication systems (chat, notification) that test real-time design. Search autocomplete and social media feed are the scale tier, then payment system — the hardest because it adds idempotency and consistency. It closes with scenario-based variants.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–13 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–13 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q13.
Interviewers rarely ask System Design Case Studies in isolation. These are the modules that most often come up in the same loop.