System design mock interview: "Design WhatsApp or Telegram" (with ex-Google EM)

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System design mock interview: "Design a messaging app like Whatsapp or Telegram" with an ex Google Engineering Manager, Mark.
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Chapters:
00:00 Intro
01:08 Question - Design Telegram
01:18 Clarifying questions (non-functional requirements)
05:03 Clarifying questions (metrics)
08:45 Clarifying questions (functional requirements)
12:30 High level design (API)
18:05 High level components
21:30 Database
30:57 Drill down (Architecture diagram)
39:40 Drill down (Message distributor)
44:17 Bottlenecks
47:40 Conclusion
50:56 Interview finishes
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