WhatsApp
How WhatsApp Served Millions of Connections per Server With a Tiny Team
How Erlang's lightweight process model and deep FreeBSD tuning let WhatsApp run hundreds of millions of users' traffic with a remarkably small team.
3 min read
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6 articles
WhatsApp
The Minimal-Operations Philosophy That Let a Tiny Team Run WhatsApp
WhatsApp famously ran hundreds of millions of users on a strikingly small engineering team by designing operational simplicity into the system itself.
3 min read
WhatsApp
Encrypting and Distributing Billions of Photos and Videos on WhatsApp
How WhatsApp delivers encrypted media efficiently by separating attachment transfer from message delivery and verifying content by hash.
3 min read
WhatsApp
Why WhatsApp Bet on FreeBSD and Tuned the Kernel Directly
WhatsApp's small infrastructure team pushed FreeBSD's kernel to hold enormous numbers of concurrent connections per server instead of scaling out horizontally.
3 min read
WhatsApp
Rolling Out End-to-End Encryption to a Billion Users
How WhatsApp partnered with Open Whisper Systems to bring Signal Protocol encryption to every chat, without most users noticing the migration.
3 min read
WhatsApp
Store-and-Forward: The Simple Idea Behind WhatsApp's Delivery Guarantees
How WhatsApp's store-and-forward architecture and layered acknowledgment model deliver messages reliably even when recipients are offline.
3 min read