Phillipe explains how he got to inherit a legacy C++ codebase that used in production, but is not in a good state. He explains his thinking process and what lead him to make the decision to do an incremental rewrite in Rust. The project in question is a library that is used in a lot of places, from mobile (Android and iOS) to embedded (ARM microcontrollers) to the backend.

In the process, he made use of some useful techniques such as fuzzing, and used various Rust FFI tooling to make the rewrite easier, as he was incrementally porting functionality from the legacy codebase to Rust.

He also explains how he got cross-compilation working for the different targets, resorting to using the Zig compiler to cross-compile for iOS.