Worked on improving code quality and protocol compliance across the rust-lang/rust and lambdaclass/ethereum_rust repositories. Enhanced documentation hygiene by updating outdated links to GitHub permalinks, increasing accessibility and accuracy for Rust documentation. Refined the unnecessary_fold lint to be commutative and improved span calculations, resulting in more precise lint suggestions and robust test coverage. Addressed path handling issues by fixing edge cases in join_absolute_paths, ensuring reliable path operations. In the ethereum_rust project, implemented ENR record persistence for unknown peers to strengthen discv5 compliance and peer discovery. Utilized Rust, Markdown, and version control, emphasizing code refactoring, testing, and technical writing.