How (and why) we rewrote our production C++ frontend infrastructure in Rust

“Should we convert our _____ code to Rust?” is a question that comes up a lot. And a lot of the time the right answer is a pretty firm, “No.” So I thought it might be beneficial (and hopefully interesting) to walk through a case where the code involved was incredibly you-cannot-fuck-this-up business-critical and when we asked that question about it, we came back with a yes. Here’s what it was, how we got to that answer, and what we did about it.
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