How WhatsApp delivers 100 billion messages every single day
Building a system that connects billions of people and delivers around 100 billion messages per day is a significant undertaking. The solution isn't limited to simply adding more servers; it is a mission-critical System Design challenge that requires extreme concurrency, global distribution, and uncompromising reliability while operating under the constraints of variable mobile networks. Supporting such scale demands an architecture that is both efficient and resilient.
The rapid growth of WhatsApp users helps illustrate why these engineering challenges are so demanding. The
