Alaa Souabni refactored the Transaction Layer in the hiero-ledger/hiero-sdk-js repository to enhance type safety and maintainability. By introducing explicit channel generics for Client typedefs, Alaa replaced ambiguous wildcard types with more precise definitions, reducing the risk of runtime type errors and clarifying the codebase for future contributors. This work, implemented using TypeScript and JavaScript, established a foundation for generics-driven improvements and smoother onboarding. The approach focused on code quality and commit-driven development, addressing maintainability concerns and improving reliability for SDK transactions. Although no bugs were fixed, the depth of the refactor improved long-term code robustness and clarity.