Developed and delivered a key feature for the logto-io/logto repository, enhancing legacy password handling by adding support for PBKDF2 hashing. The work involved implementing algorithm identification and updating the executeLegacyHash function to generate PBKDF2 hashes using parameters such as salt, iterations, key length, and digest, thereby enabling compatibility with older password schemes. This update improved backward compatibility and facilitated secure migrations for existing user accounts. The solution was implemented using TypeScript and Node.js, with a focus on backend development and cryptography. All changes were documented through a dedicated commit and pull request to ensure maintainability and traceability.