Скачать или смотреть System Design Interview Deep Dive Designing WhatsApp or Messenger at Scale

This video walks through a full system design interview focused on building a large-scale messaging platform similar to WhatsApp or Messenger. It starts by defining functional and non-functional requirements, with an emphasis on low latency, high throughput, and reliability at massive scale. The explanation then progresses through the core design steps, including identifying key entities, choosing WebSockets for persistent real-time communication, and designing APIs to support message delivery. As the architecture evolves, it addresses real-world scalability challenges such as media storage using object storage with pre-signed URLs and efficient inter-server communication using Redis Pub/Sub instead of heavier streaming systems. The video also breaks down how system design expectations differ between mid-level, senior, and staff engineers, highlighting the increasing depth of tradeoff analysis, architectural reasoning, and complexity required at each level. This is a practical guide for understanding how to approach system design interviews with clarity and structure.
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