Jin Ma worked on the Oyl-Wallet/oyl-sdk repository, focusing on improving the reliability of the command-line interface by addressing version synchronization issues between the CLI and the SDK. To solve the problem of version drift, Jin implemented a dynamic versioning mechanism in both JavaScript and TypeScript, enabling the CLI to read its version directly from package.json. This approach ensured that the CLI version always matched the SDK version across builds, reducing release inconsistencies. The work involved targeted updates to index.js and index.ts, demonstrating practical CLI development skills with Node.js and attention to maintaining robust, maintainable release processes.