System Architecture

Designing WhatsApp Messaging System

Real-time socket servers, storing chat records, and message queues.

High & Low Level Architecture Analysis

Detailed notes, trade-offs, and scaling guidelines for Designing WhatsApp Messaging System systems.

ARCHITECTURE FLOW DIAGRAM

[User Client Browser]
      │ (HTTPS traffic via DNS Route53)
      ▼
[Load Balancer Engine]
      │ (Distributing workload across API nodes)
      ├──► [Server Node A] ──► [Redis Cache (Fast Reads)]
      └──► [Server Node B] ──► [MongoDB / MySQL Database (Primary)]

High Level Design (HLD)

Decoupled systems using load balancers, caching partitions, and queue models to process messages asynchronously.

Low Level Design (LLD) & Patterns

Structured class objects adhering to SOLID rules, deploying Creational (Factory, Singleton) patterns to isolate database calls.

System Trade-offs

We balance read latency against write synchronization rules according to the CAP Theorem constraints.