Facebook Engineering Blog
An inside look at Meta’s transition from C to Rust on mobile

An inside look at Meta’s transition from C to Rust on mobile

7/1/2025 · Pascal Hartig

What this post added

This post details Meta's initiative to transition a core messaging library from C to Rust. It highlights the challenges and approach to modernizing legacy code at scale, emphasizing the optimization for 'developer happiness' as a key driver for adopting Rust. The effort impacts multiple Meta products including Messenger, Facebook, and Instagram, as well as AR/VR platforms.

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