Worked on restoring cross-architecture build functionality for the OpenAI Codex CLI, focusing on improving release reliability and developer productivity. Addressed a critical build issue by updating the Nix build configuration, removing outdated CLI build components, and refining both flake.nix and codex-rs expressions to ensure compatibility across multiple platforms. Leveraged expertise in DevOps and Nix to stabilize the build tooling, introducing a reproducible, flake-based workflow that reduced platform-specific failures and accelerated development cycles. Documented all build changes and updated developer guidance within the repository, supporting ongoing multi-architecture maintenance and facilitating smoother onboarding for future contributors to the project.