Worked on foundational features for both the GaloisInc/LibAFL and rust-lang/rustc-dev-guide repositories, focusing on system programming and compiler internals using Rust. Delivered nuanced exit-status semantics for the CommandExecutor in LibAFL, enabling the CommandConfigurator to interpret process outcomes such as out-of-memory events, crashes, and successes. Enhanced Unix-specific build configurations and improved documentation for better automation and cross-platform support. In rustc-dev-guide, introduced mutable Crate AST mutation within the after_crate_root_parsing callback, establishing a basis for driver-driven AST transformations during compilation. Emphasized AST manipulation, error handling, and executor development, contributing to more flexible and observable development workflows.