How to explain system design cases in English

Use a fixed spoken order: clarify requirements, define APIs, estimate scale, sketch storage, draw a high-level design, deep-dive two components, then name bottlenecks. Say each step in short sentences before you draw. This series drills that narration on Pastebin, Instagram, Twitter, Yelp nearby, Uber, Ticketmaster, and realtime transports so you do not freeze mid-whiteboard.

Start with the seven-step framework chapter, then Pastebin (storage and keys), a social feed (Instagram or Twitter), one geo problem (Yelp nearby or Uber), and one concurrency spike (Ticketmaster). Finish with long polling vs WebSockets vs SSE so you can explain realtime trade-offs in plain English. Practise each case out loud for 20–30 minutes, not only on paper.

Both teach system design English. This path focuses on Grokking-style product cases - Pastebin, Instagram, Twitter, nearby search, Uber, Ticketmaster - plus realtime transport choices. The other Mockly system design path covers building blocks like rate limiting, consistent hashing, and chat. Cross-link both so vocabulary and walkthroughs stay consistent under pressure.

Aim for a 35–45 minute interview shape: two to three minutes clarifying, five on estimates and APIs, then a high-level design with two deep dives. Leave five minutes for bottlenecks and follow-ups. If English slows you down, shorten each segment with rehearsed phrases from these chapters rather than skipping structure.