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Neil Mitchell

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  1. Jane Street55 min

    Neil Mitchell: Pyrefly: Type Checking 1.8 Million Lines of Python Per Second

    Neil Mitchell, Roman

    Meta engineer Neil Mitchell introduced PyreFly, an open-source Python type checker reimplemented in Rust to address performance and scalability limitations for massive codebases like Instagram. The tool utilizes an aggressive memory eviction strategy and file-level concurrency to deliver rapid IDE feedback while supporting complex type features such as structural subtyping and flow narrowing. Released under the MIT license with over 100 contributors, PyreFly aims to replace legacy systems by prioritizing broad ecosystem adoption and seamless integration with build tools like Buck.

Neil Mitchell: Interviews, Talks and Panel Discussions