Michal Gil delivered a major refactor to the staking module in the paritytech/polkadot-sdk repository, focusing on improving maintainability and clarity. He replaced all usages of pallet::getter with explicit storage getter implementations, addressing API ambiguity and making data retrieval paths more transparent for downstream clients. This work was implemented in Rust, leveraging Substrate’s pallet development framework, and included comprehensive tests to validate the correctness of the new storage getters. By emphasizing explicit patterns and thorough testing, Michal’s contribution enhanced the module’s reliability and maintainability, demonstrating a strong grasp of refactoring and testing practices within the Rust and Substrate ecosystem.