Worked on the smithy-lang/smithy-rs repository to enhance AWS SigV4 signing by upgrading the p256 crate and migrating HMAC-SHA256 operations from the ring library to RustCrypto’s hmac and sha2 crates. This transition improved maintainability and reduced dependency complexity in the Rust backend codebase. Refactored the signing flow to streamline key handling and eliminate unnecessary conversions, while expanding test coverage to ensure reliability across client and server use cases. Maintained rigorous release hygiene by updating changelogs and ensuring all features passed comprehensive cargo tests. The work demonstrated strong skills in cryptography, dependency management, and backend development using Rust.