Track 5 · Design Interview Problems
Design WhatsApp (Real-Time Messaging at Scale) Two billion active users, 100 billion messages per day. How to manage millions of persistent connections, deliver offline queues, and track the three ticks.
Interview problem 22 min read
PRO PASS REQUIRED
System Design Notes & 75 Sandboxes
This deep-dive architectural analysis is part of the System Design & 75 Labs pass.
Production War Stories: Battle-tested failure modes and zero-fluff trade-offs.75 Docker Sandboxes: Hands-on reproduction of replication lag, Kafka rebalances, Tatkal locks, etc.Interactive Simulators: Stepper animations, real metrics, and architecture diagrams.Architect-Level Rigour: Sizing estimates, API contracts, and schema designs.
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