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Building Voicebots — Telephonic & Browser, the Real Engineering

Building Voicebots — Telephonic & Browser, the Real Engineering

Voicebots have quietly become good enough to be genuinely useful — a citizen can…

Design Live Comments

Design Live Comments

“Design live comments” (Facebook Live, YouTube Live, Twitch chat) tests whether…

Pattern: Real-time Updates

Pattern: Real-time Updates

Many interview questions have a line buried in the requirements like “users…

Design a Collaborative Editor (Google Docs)

Design a Collaborative Editor (Google Docs)

“Design Google Docs” is the canonical real-time collaboration question. It looks…

Networking and Protocols

Networking and Protocols

Most candidates can draw boxes and arrows, but freeze when an interviewer asks…

Design a Chat System (WhatsApp)

Design a Chat System (WhatsApp)

“Design WhatsApp” is one of the most popular system design interview questions…