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  1. Jane Street56 min

    How Jane Street Does Code Review

    Spiros

    Jane Street engineers utilize Iron, a custom Mercurial-based review platform, to enforce mechanical code reading and branch-level state management that eliminates redundant reviews during rebases and merges. The system integrates feedback directly into source code and centralizes safety policies to support nested branch workflows, treating entire branch sequences as atomic units rather than individual commits. By combining a specialized Emacs client with a persistent task dashboard, the tool facilitates collaborative editing, automated file ownership obligations, and the review of non-code assets like configuration files and trading limits.