Jakub worked on the foundry-rs/starknet-foundry repository, delivering a comprehensive refactor of the verify command to improve code organization and maintainability. He modularized the command’s implementation by splitting it into subdirectories and introducing explorer and walnut verification interfaces, all while preserving existing behavior. This restructuring clarified the boundaries within the verification subsystem, enabling safer and faster future enhancements. Jakub’s approach focused on refactoring and command line interface design, utilizing both Rust and Python to reorganize verification logic into discrete modules. The work laid a solid foundation for extensibility, demonstrating thoughtful engineering depth within a short development period.