- Published on July 16, 2025
- In Global Tech
Why Meta’s Billion-User Apps are Switching from C to Rust
The social media giant put an end to its memory management woes by moving to Rust from C.
Image by Nalini Nirad
- By Supreeth Koundinya
When Meta’s popular apps, including Instagram and Facebook Messenger, utilised a decade-old C codebase for their messaging library, it led to problems with memory management and a subpar developer experience.
The company eventually switched to Rust, one of the most popular languages today.
In an episode of Meta Tech Podcast, three of the company’s engineers – Eliane W, Buping W, and Pascal Hartig shared their experience with using C, discussing the challenges faced, the migration process, and their success with Rust.
The Problems With C
The company chose C for its speed, compact binaries, and seamless integration on iOS via Core Foundation and Android via JNI. Moreover, it helped avoid the extra overhead and complexity of C++ runtimes.
But as the
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Supreeth Koundinya
Supreeth is an engineering graduate who is curious about the world of artificial intelligence and loves to write stories on how it is solving problems and shaping the future of humanity.
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