RUST AT SCALE: AN ADDED LAYER OF SECURITY FOR WHATSAPP

Summary from the TLDR Dev newsletter

WhatsApp added a layer of security for three billion users by replacing 160,000 lines of C++ with 90,000 lines of Rust. This global deployment, called Kaleidoscope, mitigates memory safety vulnerabilities in media processing. The cross-platform migration improved performance and runtime memory usage across Android, iOS, and web clients.