WhatsApp's Rust Rewrite: 160K C++ to 90K Rust Code
WhatsApp's massive rewrite of its media handling code from 160,000 lines of C++ to just 90,000 lines of Rust represents one of the most significant real-world validations of Rust's safety promises. This deep dive explores what actually changed, why it matters for security, and what developers can learn from this monumental migration.
12 min read
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Jan 30, 2026