Meta’s primary supported server-side languages are Hack, C++, Rust, and Python. For performance-sensitive back-end services, we encourage C++ and Rust. For business logic and relatively stateless applications, the Hack ecosystem has the highest level of automation and support at Meta and is the recommended language.

3m read timeFrom engineering.fb.com
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What is a supported language at Meta?How did we arrive at our list of supported languages?Rust is the latest server-side language at Meta
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